JUCE/modules/juce_audio_formats/codecs/juce_MP3AudioFormat.cpp

/*
  ==============================================================================

   This file is part of the JUCE library.
   Copyright (c) 2022 - Raw Material Software Limited

   JUCE is an open source library subject to commercial or open-source
   licensing.

   By using JUCE, you agree to the terms of both the JUCE 7 End-User License
   Agreement and JUCE Privacy Policy.

   End User License Agreement: www.juce.com/juce-7-licence
   Privacy Policy: www.juce.com/juce-privacy-policy

   Or: You may also use this code under the terms of the GPL v3 (see
   www.gnu.org/licenses).

   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
   DISCLAIMED.

  ==============================================================================
*/

namespace juce
{

/*
    IMPORTANT DISCLAIMER: By choosing to enable the JUCE_USE_MP3AUDIOFORMAT flag and
    to compile this MP3 code into your software, you do so AT YOUR OWN RISK! By doing so,
    you are agreeing that Raw Material Software Limited is in no way responsible for any patent,
    copyright, or other legal issues that you may suffer as a result.

    The code in juce_MP3AudioFormat.cpp is NOT guaranteed to be free from infringements of 3rd-party
    intellectual property. If you wish to use it, please seek your own independent advice about the
    legality of doing so. If you are not willing to accept full responsibility for the consequences
    of using this code, then do not enable the JUCE_USE_MP3AUDIOFORMAT setting.
*/
#if JUCE_USE_MP3AUDIOFORMAT

namespace MP3Decoder
{

struct AllocationTable
{
    int16 bits, d;
};

constexpr AllocationTable allocTable0[] =
{
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},  {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}
};

constexpr AllocationTable allocTable1[] =
{
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {3, -3}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767}, {3, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {16, -32767},
    {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767},
    {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}, {2, 0}, {5, 3}, {7, 5}, {16, -32767}
};

constexpr AllocationTable allocTable2[] =
{
    {4, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383},
    {4, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}
};

constexpr AllocationTable allocTable3[] =
{
    {4, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383},
    {4, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191}, {15, -16383},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}
};

constexpr AllocationTable allocTable4[] =
{
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191},
    {4, 0}, {5, 3}, {7, 5}, {3, -3}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {8, -127}, {9, -255}, {10, -511}, {11, -1023}, {12, -2047}, {13, -4095}, {14, -8191},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63},
    {3, 0}, {5, 3}, {7, 5}, {10, 9}, {4, -7}, {5, -15}, {6, -31}, {7, -63}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9},
    {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9},
    {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9},
    {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9},
    {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9}, {2, 0}, {5, 3}, {7, 5}, {10, 9},
    {2, 0}, {5, 3}, {7, 5}, {10, 9}
};

struct BandInfoStruct
{
    int16 longIndex[23];
    int16 longDiff[22];
    int16 shortIndex[14];
    int16 shortDiff[13];
};

constexpr BandInfoStruct bandInfo[9] =
{
  { {0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576},
    {4, 4, 4, 4, 4, 4, 6, 6, 8, 8, 10, 12, 16, 20, 24, 28, 34, 42, 50, 54, 76, 158},
    {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 30 * 3, 40 * 3, 52 * 3, 66 * 3, 84 * 3, 106 * 3, 136 * 3, 192 * 3},
    {4, 4, 4, 4, 6, 8, 10, 12, 14, 18, 22, 30, 56} },

  { {0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576},
    {4, 4, 4, 4, 4, 4, 6, 6, 6, 8, 10, 12, 16, 18, 22, 28, 34, 40, 46, 54, 54, 192},
    {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 28 * 3, 38 * 3, 50 * 3, 64 * 3, 80 * 3, 100 * 3, 126 * 3, 192 * 3},
    {4, 4, 4, 4, 6, 6, 10, 12, 14, 16, 20, 26, 66} },

  { {0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576},
    {4, 4, 4, 4, 4, 4, 6, 6, 8, 10, 12, 16, 20, 24, 30, 38, 46, 56, 68, 84, 102, 26},
    {0, 4 * 3, 8 * 3, 12 * 3, 16 * 3, 22 * 3, 30 * 3, 42 * 3, 58 * 3, 78 * 3, 104 * 3, 138 * 3, 180 * 3, 192 * 3},
    {4, 4, 4, 4, 6, 8, 12, 16, 20, 26, 34, 42, 12} },

  { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
    {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54 },
    {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 24 * 3, 32 * 3, 42 * 3, 56 * 3, 74 * 3, 100 * 3, 132 * 3, 174 * 3, 192 * 3},
    {4, 4, 4, 6, 6, 8, 10, 14, 18, 26, 32, 42, 18 } },

  { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 332, 394, 464, 540, 576},
    {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 18, 22, 26, 32, 38, 46, 54, 62, 70, 76, 36 },
    {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 26 * 3, 36 * 3, 48 * 3, 62 * 3, 80 * 3, 104 * 3, 136 * 3, 180 * 3, 192 * 3},
    {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 32, 44, 12 } },

  { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
    {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54 },
    {0, 4 * 3, 8 * 3, 12 * 3, 18 * 3, 26 * 3, 36 * 3, 48 * 3, 62 * 3, 80 * 3, 104 * 3, 134 * 3, 174 * 3, 192 * 3},
    {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18 } },

  { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
    {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54},
    {0, 12, 24, 36, 54, 78, 108, 144, 186, 240, 312, 402, 522, 576},
    {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18} },

  { {0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
    {6, 6, 6, 6, 6, 6, 8, 10, 12, 14, 16, 20, 24, 28, 32, 38, 46, 52, 60, 68, 58, 54},
    {0, 12, 24, 36, 54, 78, 108, 144, 186, 240, 312, 402, 522, 576},
    {4, 4, 4, 6, 8, 10, 12, 14, 18, 24, 30, 40, 18} },

  { {0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576},
    {12, 12, 12, 12, 12, 12, 16, 20, 24, 28, 32, 40, 48, 56, 64, 76, 90, 2, 2, 2, 2, 2},
    {0, 24, 48, 72, 108, 156, 216, 288, 372, 480, 486, 492, 498, 576},
    {8, 8, 8, 12, 16, 20, 24, 28, 36, 2, 2, 2, 26} }
};

constexpr double decodeWindow[] =
{
    0.000000000, -0.000015259, -0.000015259, -0.000015259, -0.000015259, -0.000015259, -0.000015259, -0.000030518,
   -0.000030518, -0.000030518, -0.000030518, -0.000045776, -0.000045776, -0.000061035, -0.000061035, -0.000076294,
   -0.000076294, -0.000091553, -0.000106812, -0.000106812, -0.000122070, -0.000137329, -0.000152588, -0.000167847,
   -0.000198364, -0.000213623, -0.000244141, -0.000259399, -0.000289917, -0.000320435, -0.000366211, -0.000396729,
   -0.000442505, -0.000473022, -0.000534058, -0.000579834, -0.000625610, -0.000686646, -0.000747681, -0.000808716,
   -0.000885010, -0.000961304, -0.001037598, -0.001113892, -0.001205444, -0.001296997, -0.001388550, -0.001480103,
   -0.001586914, -0.001693726, -0.001785278, -0.001907349, -0.002014160, -0.002120972, -0.002243042, -0.002349854,
   -0.002456665, -0.002578735, -0.002685547, -0.002792358, -0.002899170, -0.002990723, -0.003082275, -0.003173828,
   -0.003250122, -0.003326416, -0.003387451, -0.003433228, -0.003463745, -0.003479004, -0.003479004, -0.003463745,
   -0.003417969, -0.003372192, -0.003280640, -0.003173828, -0.003051758, -0.002883911, -0.002700806, -0.002487183,
   -0.002227783, -0.001937866, -0.001617432, -0.001266479, -0.000869751, -0.000442505,  0.000030518,  0.000549316,
    0.001098633,  0.001693726,  0.002334595,  0.003005981,  0.003723145,  0.004486084,  0.005294800,  0.006118774,
    0.007003784,  0.007919312,  0.008865356,  0.009841919,  0.010848999,  0.011886597,  0.012939453,  0.014022827,
    0.015121460,  0.016235352,  0.017349243,  0.018463135,  0.019577026,  0.020690918,  0.021789551,  0.022857666,
    0.023910522,  0.024932861,  0.025909424,  0.026840210,  0.027725220,  0.028533936,  0.029281616,  0.029937744,
    0.030532837,  0.031005859,  0.031387329,  0.031661987,  0.031814575,  0.031845093,  0.031738281,  0.031478882,
    0.031082153,  0.030517578,  0.029785156,  0.028884888,  0.027801514,  0.026535034,  0.025085449,  0.023422241,
    0.021575928,  0.019531250,  0.017257690,  0.014801025,  0.012115479,  0.009231567,  0.006134033,  0.002822876,
   -0.000686646, -0.004394531, -0.008316040, -0.012420654, -0.016708374, -0.021179199, -0.025817871, -0.030609131,
   -0.035552979, -0.040634155, -0.045837402, -0.051132202, -0.056533813, -0.061996460, -0.067520142, -0.073059082,
   -0.078628540, -0.084182739, -0.089706421, -0.095169067, -0.100540161, -0.105819702, -0.110946655, -0.115921021,
   -0.120697021, -0.125259399, -0.129562378, -0.133590698, -0.137298584, -0.140670776, -0.143676758, -0.146255493,
   -0.148422241, -0.150115967, -0.151306152, -0.151962280, -0.152069092, -0.151596069, -0.150497437, -0.148773193,
   -0.146362305, -0.143264771, -0.139450073, -0.134887695, -0.129577637, -0.123474121, -0.116577148, -0.108856201,
   -0.100311279, -0.090927124, -0.080688477, -0.069595337, -0.057617187, -0.044784546, -0.031082153, -0.016510010,
   -0.001068115,  0.015228271,  0.032379150,  0.050354004,  0.069168091,  0.088775635,  0.109161377,  0.130310059,
    0.152206421,  0.174789429,  0.198059082,  0.221984863,  0.246505737,  0.271591187,  0.297210693,  0.323318481,
    0.349868774,  0.376800537,  0.404083252,  0.431655884,  0.459472656,  0.487472534,  0.515609741,  0.543823242,
    0.572036743,  0.600219727,  0.628295898,  0.656219482,  0.683914185,  0.711318970,  0.738372803,  0.765029907,
    0.791213989,  0.816864014,  0.841949463,  0.866363525,  0.890090942,  0.913055420,  0.935195923,  0.956481934,
    0.976852417,  0.996246338,  1.014617920,  1.031936646,  1.048156738,  1.063217163,  1.077117920,  1.089782715,
    1.101211548,  1.111373901,  1.120223999,  1.127746582,  1.133926392,  1.138763428,  1.142211914,  1.144287109,
    1.144989014
};

constexpr int16 huffmanTab0[] = { 0 };
constexpr int16 huffmanTab1[] = { -5,-3,-1,17,1,16,0 };
constexpr int16 huffmanTab2[] = { -15,-11,-9,-5,-3,-1,34,2,18,-1,33,32,17,-1,1,16,0 };
constexpr int16 huffmanTab3[] = { -13,-11,-9,-5,-3,-1,34,2,18,-1,33,32,16,17,-1,1,0 };
constexpr int16 huffmanTab5[] = { -29,-25,-23,-15,-7,-5,-3,-1,51,35,50,49,-3,-1,19,3,-1,48,34,-3,-1,18,33,-1,2,32,17,-1,1,16,0 };
constexpr int16 huffmanTab6[] = { -25,-19,-13,-9,-5,-3,-1,51,3,35,-1,50,48,-1,19,49,-3,-1,34,2,18,-3,-1,33,32,1,-1,17,-1,16,0 };

constexpr int16 huffmanTab7[] =
{
    -69,-65,-57,-39,-29,-17,-11,-7,-3,-1,85,69,-1,84,83,-1,53,68,-3,-1,37,82,21,-5,-1,81,-1,5,52,-1,80,-1,67,51,
    -5,-3,-1,36,66,20,-1,65,64,-11,-7,-3,-1,4,35,-1,50,3,-1,19,49,-3,-1,48,34,18,-5,-1,33,-1,2,32,17,-1,1,16,0
};

constexpr int16 huffmanTab8[] =
{
    -65,-63,-59,-45,-31,-19,-13,-7,-5,-3,-1,85,84,69,83,-3,-1,53,68,37,-3,-1,82,5,21,-5,-1,81,-1,52,67,-3,-1,80,
    51,36,-5,-3,-1,66,20,65,-3,-1,4,64,-1,35,50,-9,-7,-3,-1,19,49,-1,3,48,34,-1,2,32,-1,18,33,17,-3,-1,1,16,0
};

constexpr int16 huffmanTab9[] =
{
    -63,-53,-41,-29,-19,-11,-5,-3,-1,85,69,53,-1,83,-1,84,5,-3,-1,68,37,-1,82,21,-3,-1,81,52,-1,67,-1,80,4,-7,-3,
    -1,36,66,-1,51,64,-1,20,65,-5,-3,-1,35,50,19,-1,49,-1,3,48,-5,-3,-1,34,2,18,-1,33,32,-3,-1,17,1,-1,16,0
};

constexpr int16 huffmanTab10[] =
{
    -125,-121,-111,-83,-55,-35,-21,-13,-7,-3,-1,119,103,-1,118,87,-3,-1,117,102,71,-3,-1,116,86,-1,101,55,-9,-3,
    -1,115,70,-3,-1,85,84,99,-1,39,114,-11,-5,-3,-1,100,7,112,-1,98,-1,69,53,-5,-1,6,-1,83,68,23,-17,-5,-1,113,
    -1,54,38,-5,-3,-1,37,82,21,-1,81,-1,52,67,-3,-1,22,97,-1,96,-1,5,80,-19,-11,-7,-3,-1,36,66,-1,51,4,-1,20,
    65,-3,-1,64,35,-1,50,3,-3,-1,19,49,-1,48,34,-7,-3,-1,18,33,-1,2,32,17,-1,1,16,0
};

constexpr int16 huffmanTab11[] =
{
    -121,-113,-89,-59,-43,-27,-17,-7,-3,-1,119,103,-1,118,117,-3,-1,102,71,-1,116,-1,87,85,-5,-3,-1,86,101,55,
    -1,115,70,-9,-7,-3,-1,69,84,-1,53,83,39,-1,114,-1,100,7,-5,-1,113,-1,23,112,-3,-1,54,99,-1,96,-1,68,37,-13,
    -7,-5,-3,-1,82,5,21,98,-3,-1,38,6,22,-5,-1,97,-1,81,52,-5,-1,80,-1,67,51,-1,36,66,-15,-11,-7,-3,-1,20,65,
    -1,4,64,-1,35,50,-1,19,49,-5,-3,-1,3,48,34,33,-5,-1,18,-1,2,32,17,-3,-1,1,16,0
};

constexpr int16 huffmanTab12[] =
{
    -115,-99,-73,-45,-27,-17,-9,-5,-3,-1,119,103,118,-1,87,117,-3,-1,102,71,-1,116,101,-3,-1,86,55,-3,-1,115,
    85,39,-7,-3,-1,114,70,-1,100,23,-5,-1,113,-1,7,112,-1,54,99,-13,-9,-3,-1,69,84,-1,68,-1,6,5,-1,38,98,-5,
    -1,97,-1,22,96,-3,-1,53,83,-1,37,82,-17,-7,-3,-1,21,81,-1,52,67,-5,-3,-1,80,4,36,-1,66,20,-3,-1,51,65,-1,
    35,50,-11,-7,-5,-3,-1,64,3,48,19,-1,49,34,-1,18,33,-7,-5,-3,-1,2,32,0,17,-1,1,16
};

constexpr int16 huffmanTab13[] =
{
    -509,-503,-475,-405,-333,-265,-205,-153,-115,-83,-53,-35,-21,-13,-9,-7,-5,-3,-1,254,252,253,237,255,-1,239,223,
    -3,-1,238,207,-1,222,191,-9,-3,-1,251,206,-1,220,-1,175,233,-1,236,221,-9,-5,-3,-1,250,205,190,-1,235,159,-3,
    -1,249,234,-1,189,219,-17,-9,-3,-1,143,248,-1,204,-1,174,158,-5,-1,142,-1,127,126,247,-5,-1,218,-1,173,188,-3,
    -1,203,246,111,-15,-7,-3,-1,232,95,-1,157,217,-3,-1,245,231,-1,172,187,-9,-3,-1,79,244,-3,-1,202,230,243,-1,
    63,-1,141,216,-21,-9,-3,-1,47,242,-3,-1,110,156,15,-5,-3,-1,201,94,171,-3,-1,125,215,78,-11,-5,-3,-1,200,214,
    62,-1,185,-1,155,170,-1,31,241,-23,-13,-5,-1,240,-1,186,229,-3,-1,228,140,-1,109,227,-5,-1,226,-1,46,14,-1,30,
    225,-15,-7,-3,-1,224,93,-1,213,124,-3,-1,199,77,-1,139,184,-7,-3,-1,212,154,-1,169,108,-1,198,61,-37,-21,-9,-5,
    -3,-1,211,123,45,-1,210,29,-5,-1,183,-1,92,197,-3,-1,153,122,195,-7,-5,-3,-1,167,151,75,209,-3,-1,13,208,-1,
    138,168,-11,-7,-3,-1,76,196,-1,107,182,-1,60,44,-3,-1,194,91,-3,-1,181,137,28,-43,-23,-11,-5,-1,193,-1,152,12,
    -1,192,-1,180,106,-5,-3,-1,166,121,59,-1,179,-1,136,90,-11,-5,-1,43,-1,165,105,-1,164,-1,120,135,-5,-1,148,-1,
    119,118,178,-11,-3,-1,27,177,-3,-1,11,176,-1,150,74,-7,-3,-1,58,163,-1,89,149,-1,42,162,-47,-23,-9,-3,-1,26,
    161,-3,-1,10,104,160,-5,-3,-1,134,73,147,-3,-1,57,88,-1,133,103,-9,-3,-1,41,146,-3,-1,87,117,56,-5,-1,131,-1,
    102,71,-3,-1,116,86,-1,101,115,-11,-3,-1,25,145,-3,-1,9,144,-1,72,132,-7,-5,-1,114,-1,70,100,40,-1,130,24,-41,
    -27,-11,-5,-3,-1,55,39,23,-1,113,-1,85,7,-7,-3,-1,112,54,-1,99,69,-3,-1,84,38,-1,98,53,-5,-1,129,-1,8,128,-3,
    -1,22,97,-1,6,96,-13,-9,-5,-3,-1,83,68,37,-1,82,5,-1,21,81,-7,-3,-1,52,67,-1,80,36,-3,-1,66,51,20,-19,-11,
    -5,-1,65,-1,4,64,-3,-1,35,50,19,-3,-1,49,3,-1,48,34,-3,-1,18,33,-1,2,32,-3,-1,17,1,16,0
};

constexpr int16 huffmanTab15[] =
{
    -495,-445,-355,-263,-183,-115,-77,-43,-27,-13,-7,-3,-1,255,239,-1,254,223,-1,238,-1,253,207,-7,-3,-1,252,222,-1,
    237,191,-1,251,-1,206,236,-7,-3,-1,221,175,-1,250,190,-3,-1,235,205,-1,220,159,-15,-7,-3,-1,249,234,-1,189,219,
    -3,-1,143,248,-1,204,158,-7,-3,-1,233,127,-1,247,173,-3,-1,218,188,-1,111,-1,174,15,-19,-11,-3,-1,203,246,
    -3,-1,142,232,-1,95,157,-3,-1,245,126,-1,231,172,-9,-3,-1,202,187,-3,-1,217,141,79,-3,-1,244,63,-1,243,216,
    -33,-17,-9,-3,-1,230,47,-1,242,-1,110,240,-3,-1,31,241,-1,156,201,-7,-3,-1,94,171,-1,186,229,-3,-1,125,215,
    -1,78,228,-15,-7,-3,-1,140,200,-1,62,109,-3,-1,214,227,-1,155,185,-7,-3,-1,46,170,-1,226,30,-5,-1,225,-1,14,
    224,-1,93,213,-45,-25,-13,-7,-3,-1,124,199,-1,77,139,-1,212,-1,184,154,-7,-3,-1,169,108,-1,198,61,-1,211,210,
    -9,-5,-3,-1,45,13,29,-1,123,183,-5,-1,209,-1,92,208,-1,197,138,-17,-7,-3,-1,168,76,-1,196,107,-5,-1,182,-1,
    153,12,-1,60,195,-9,-3,-1,122,167,-1,166,-1,192,11,-1,194,-1,44,91,-55,-29,-15,-7,-3,-1,181,28,-1,137,152,-3,
    -1,193,75,-1,180,106,-5,-3,-1,59,121,179,-3,-1,151,136,-1,43,90,-11,-5,-1,178,-1,165,27,-1,177,-1,176,105,-7,
    -3,-1,150,74,-1,164,120,-3,-1,135,58,163,-17,-7,-3,-1,89,149,-1,42,162,-3,-1,26,161,-3,-1,10,160,104,-7,-3,
    -1,134,73,-1,148,57,-5,-1,147,-1,119,9,-1,88,133,-53,-29,-13,-7,-3,-1,41,103,-1,118,146,-1,145,-1,25,144,-7,
    -3,-1,72,132,-1,87,117,-3,-1,56,131,-1,102,71,-7,-3,-1,40,130,-1,24,129,-7,-3,-1,116,8,-1,128,86,-3,-1,101,
    55,-1,115,70,-17,-7,-3,-1,39,114,-1,100,23,-3,-1,85,113,-3,-1,7,112,54,-7,-3,-1,99,69,-1,84,38,-3,-1,98,22,
    -3,-1,6,96,53,-33,-19,-9,-5,-1,97,-1,83,68,-1,37,82,-3,-1,21,81,-3,-1,5,80,52,-7,-3,-1,67,36,-1,66,51,-1,
    65,-1,20,4,-9,-3,-1,35,50,-3,-1,64,3,19,-3,-1,49,48,34,-9,-7,-3,-1,18,33,-1,2,32,17,-3,-1,1,16,0
};

constexpr int16 huffmanTab16[] =
{
    -509,-503,-461,-323,-103,-37,-27,-15,-7,-3,-1,239,254,-1,223,253,-3,-1,207,252,-1,191,251,-5,-1,175,-1,250,159,
    -3,-1,249,248,143,-7,-3,-1,127,247,-1,111,246,255,-9,-5,-3,-1,95,245,79,-1,244,243,-53,-1,240,-1,63,-29,-19,
    -13,-7,-5,-1,206,-1,236,221,222,-1,233,-1,234,217,-1,238,-1,237,235,-3,-1,190,205,-3,-1,220,219,174,-11,-5,
    -1,204,-1,173,218,-3,-1,126,172,202,-5,-3,-1,201,125,94,189,242,-93,-5,-3,-1,47,15,31,-1,241,-49,-25,-13,
    -5,-1,158,-1,188,203,-3,-1,142,232,-1,157,231,-7,-3,-1,187,141,-1,216,110,-1,230,156,-13,-7,-3,-1,171,186,
    -1,229,215,-1,78,-1,228,140,-3,-1,200,62,-1,109,-1,214,155,-19,-11,-5,-3,-1,185,170,225,-1,212,-1,184,169,
    -5,-1,123,-1,183,208,227,-7,-3,-1,14,224,-1,93,213,-3,-1,124,199,-1,77,139,-75,-45,-27,-13,-7,-3,-1,154,
    108,-1,198,61,-3,-1,92,197,13,-7,-3,-1,138,168,-1,153,76,-3,-1,182,122,60,-11,-5,-3,-1,91,137,28,-1,192,-1,
    152,121,-1,226,-1,46,30,-15,-7,-3,-1,211,45,-1,210,209,-5,-1,59,-1,151,136,29,-7,-3,-1,196,107,-1,195,167,-1,
    44,-1,194,181,-23,-13,-7,-3,-1,193,12,-1,75,180,-3,-1,106,166,179,-5,-3,-1,90,165,43,-1,178,27,-13,-5,-1,177,
    -1,11,176,-3,-1,105,150,-1,74,164,-5,-3,-1,120,135,163,-3,-1,58,89,42,-97,-57,-33,-19,-11,-5,-3,-1,149,104,161,
    -3,-1,134,119,148,-5,-3,-1,73,87,103,162,-5,-1,26,-1,10,160,-3,-1,57,147,-1,88,133,-9,-3,-1,41,146,-3,-1,118,
    9,25,-5,-1,145,-1,144,72,-3,-1,132,117,-1,56,131,-21,-11,-5,-3,-1,102,40,130,-3,-1,71,116,24,-3,-1,129,128,-3,
    -1,8,86,55,-9,-5,-1,115,-1,101,70,-1,39,114,-5,-3,-1,100,85,7,23,-23,-13,-5,-1,113,-1,112,54,-3,-1,99,69,-1,
    84,38,-3,-1,98,22,-1,97,-1,6,96,-9,-5,-1,83,-1,53,68,-1,37,82,-1,81,-1,21,5,-33,-23,-13,-7,-3,-1,52,67,-1,80,
    36,-3,-1,66,51,20,-5,-1,65,-1,4,64,-1,35,50,-3,-1,19,49,-3,-1,3,48,34,-3,-1,18,33,-1,2,32,-3,-1,17,1,16,0
};

constexpr int16 huffmanTab24[] =
{
    -451,-117,-43,-25,-15,-7,-3,-1,239,254,-1,223,253,-3,-1,207,252,-1,191,251,-5,-1,250,-1,175,159,-1,249,248,-9,
    -5,-3,-1,143,127,247,-1,111,246,-3,-1,95,245,-1,79,244,-71,-7,-3,-1,63,243,-1,47,242,-5,-1,241,-1,31,240,-25,-9,
    -1,15,-3,-1,238,222,-1,237,206,-7,-3,-1,236,221,-1,190,235,-3,-1,205,220,-1,174,234,-15,-7,-3,-1,189,219,-1,204,
    158,-3,-1,233,173,-1,218,188,-7,-3,-1,203,142,-1,232,157,-3,-1,217,126,-1,231,172,255,-235,-143,-77,-45,-25,-15,
    -7,-3,-1,202,187,-1,141,216,-5,-3,-1,14,224,13,230,-5,-3,-1,110,156,201,-1,94,186,-9,-5,-1,229,-1,171,125,-1,215,
    228,-3,-1,140,200,-3,-1,78,46,62,-15,-7,-3,-1,109,214,-1,227,155,-3,-1,185,170,-1,226,30,-7,-3,-1,225,93,-1,213,124,
    -3,-1,199,77,-1,139,184,-31,-15,-7,-3,-1,212,154,-1,169,108,-3,-1,198,61,-1,211,45,-7,-3,-1,210,29,-1,123,183,-3,-1,
    209,92,-1,197,138,-17,-7,-3,-1,168,153,-1,76,196,-3,-1,107,182,-3,-1,208,12,60,-7,-3,-1,195,122,-1,167,44,-3,-1,194,
    91,-1,181,28,-57,-35,-19,-7,-3,-1,137,152,-1,193,75,-5,-3,-1,192,11,59,-3,-1,176,10,26,-5,-1,180,-1,106,166,-3,-1,121,
    151,-3,-1,160,9,144,-9,-3,-1,179,136,-3,-1,43,90,178,-7,-3,-1,165,27,-1,177,105,-1,150,164,-17,-9,-5,-3,-1,74,120,135,
    -1,58,163,-3,-1,89,149,-1,42,162,-7,-3,-1,161,104,-1,134,119,-3,-1,73,148,-1,57,147,-63,-31,-15,-7,-3,-1,88,133,-1,41,
    103,-3,-1,118,146,-1,25,145,-7,-3,-1,72,132,-1,87,117,-3,-1,56,131,-1,102,40,-17,-7,-3,-1,130,24,-1,71,116,-5,-1,129,
    -1,8,128,-1,86,101,-7,-5,-1,23,-1,7,112,115,-3,-1,55,39,114,-15,-7,-3,-1,70,100,-1,85,113,-3,-1,54,99,-1,69,84,-7,-3,
    -1,38,98,-1,22,97,-5,-3,-1,6,96,53,-1,83,68,-51,-37,-23,-15,-9,-3,-1,37,82,-1,21,-1,5,80,-1,81,-1,52,67,-3,-1,36,66,
    -1,51,20,-9,-5,-1,65,-1,4,64,-1,35,50,-1,19,49,-7,-5,-3,-1,3,48,34,18,-1,33,-1,2,32,-3,-1,17,1,-1,16,0
};

struct BitsToTableMap
{
    uint32 bits;
    const int16* table;
};

constexpr BitsToTableMap huffmanTables1[] =
{
    { 0, huffmanTab0  }, { 0, huffmanTab1  }, { 0,  huffmanTab2  }, { 0,  huffmanTab3  },
    { 0, huffmanTab0  }, { 0, huffmanTab5  }, { 0,  huffmanTab6  }, { 0,  huffmanTab7  },
    { 0, huffmanTab8  }, { 0, huffmanTab9  }, { 0,  huffmanTab10 }, { 0,  huffmanTab11 },
    { 0, huffmanTab12 }, { 0, huffmanTab13 }, { 0,  huffmanTab0  }, { 0,  huffmanTab15 },
    { 1, huffmanTab16 }, { 2, huffmanTab16 }, { 3,  huffmanTab16 }, { 4,  huffmanTab16 },
    { 6, huffmanTab16 }, { 8, huffmanTab16 }, { 10, huffmanTab16 }, { 13, huffmanTab16 },
    { 4, huffmanTab24 }, { 5, huffmanTab24 }, { 6,  huffmanTab24 }, { 7,  huffmanTab24 },
    { 8, huffmanTab24 }, { 9, huffmanTab24 }, { 11, huffmanTab24 }, { 13, huffmanTab24 }
};

constexpr int16 huffmanTabC0[] = { -29,-21,-13,-7,-3,-1,11,15,-1,13,14,-3,-1,7,5,9,-3,-1,6,3,-1,10,12,-3,-1,2,1,-1,4,8,0 };
constexpr int16 huffmanTabC1[] = { -15,-7,-3,-1,15,14,-1,13,12,-3,-1,11,10,-1,9,8,-7,-3,-1,7,6,-1,5,4,-3,-1,3,2,-1,1,0 };

constexpr BitsToTableMap huffmanTables2[] = { { 0, huffmanTabC0 }, { 0, huffmanTabC1 } };

//==============================================================================
struct VBRTagData
{
    bool read (const uint8* data) noexcept
    {
        flags = 0;

        const int layer = (data[1] >> 1) & 3;
        if (layer != 1)
            return false;

        const int type = (data[1] >> 3) & 1;
        const int sampleRateIndex = (data[2] >> 2) & 3;
        const int mode = (data[3] >> 6) & 3;

        static constexpr short bitRates[3][16] =
        {
            { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160, -1 }, // MPEG2
            { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, -1 }, // MPEG1
            { 0, 8, 16, 24, 32, 40, 48, 56, 64, -1, -1, -1, -1, -1, -1, -1 }, // MPEG 2.5
        };

        const int bitrate = bitRates[type][((data[2] >> 4) & 15)];

        const int sampleRates[3][4] =
        {
            { 22050, 24000, 16000, -1 }, // MPEG2
            { 44100, 48000, 32000, -1 }, // MPEG1
            { 11025, 12000, 8000,  -1 }, // MPEG2.5
        };

        if ((data[1] >> 4) == 0xe)
            sampleRate = sampleRates[2][sampleRateIndex];
        else
            sampleRate = sampleRates[type][sampleRateIndex];

        data += type != 0 ? (mode != 3 ? (32 + 4) : (17 + 4))
                          : (mode != 3 ? (17 + 4) : (9 + 4));

        if (! isVbrTag (data))
            return false;

        data += 4;
        flags = ByteOrder::bigEndianInt (data);
        data += 4;

        if (flags & 1)
        {
            frames = ByteOrder::bigEndianInt (data);
            data += 4;
        }

        if (flags & 2)
        {
            bytes = ByteOrder::bigEndianInt (data);
            data += 4;
        }

        if (flags & 4)
        {
            for (int i = 0; i < 100; ++i)
                toc[i] = data[i];

            data += 100;
        }

        vbrScale = -1;

        if (flags & 8)
            vbrScale = (int) ByteOrder::bigEndianInt (data);

        headersize = ((type + 1) * 72000 * bitrate) / sampleRate;
        return true;
    }

    uint8 toc[100];
    int sampleRate, vbrScale, headersize;
    unsigned int flags, frames, bytes;

private:
    static bool isVbrTag (const uint8* d) noexcept
    {
        return (d[0] == 'X' && d[1] == 'i' && d[2] == 'n' && d[3] == 'g')
            || (d[0] == 'I' && d[1] == 'n' && d[2] == 'f' && d[3] == 'o');
    }
};

//==============================================================================
struct MP3Frame
{
    MP3Frame()
    {
        zeromem (this, sizeof (MP3Frame));
        single = -1;
    }

    void selectLayer2Table()
    {
        static constexpr int translate[3][2][16] =
        {
            { { 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 1, 1, 1, 1, 1, 0 }, { 0, 2, 2, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 } },
            { { 0, 2, 2, 2, 2, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0 }, { 0, 2, 2, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 } },
            { { 0, 3, 3, 3, 3, 3, 3, 0, 0, 0, 1, 1, 1, 1, 1, 0 }, { 0, 3, 3, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0 } }
        };

        static const AllocationTable* const tables[] = { allocTable0, allocTable1, allocTable2, allocTable3, allocTable4 };
        static constexpr int8 limits[] = { 27, 30, 8, 12, 30 };

        const int index = lsf ? 4 : translate[sampleRateIndex][2 - numChannels][bitrateIndex];
        layer2SubBandLimit = limits[index];
        allocationTable = tables[index];
    }

    int getFrequency() const noexcept
    {
        const int frequencies[] = { 44100, 48000, 32000, 22050, 24000, 16000, 11025, 12000, 8000 };
        return frequencies[sampleRateIndex];
    }

    enum class ParseSuccessful { no, yes };

    ParseSuccessful decodeHeader (const uint32 header)
    {
        jassert (((header >> 10) & 3) != 3);

        mpeg25              = (header & (1 << 20)) == 0;
        lsf                 = mpeg25 ? 1 : ((header & (1 << 19)) ? 0 : 1);
        layer               = (int) (4 - ((header >> 17) & 3));
        sampleRateIndex     = (int) ((header >> 10) & 3) + (mpeg25 ? 6 : (lsf * 3));
        crc16FollowsHeader  = ((header >> 16) & 1) == 0;
        bitrateIndex        = (header >> 12) & 15;
        padding             = (header >> 9) & 1;
        mode                = (header >> 6) & 3;
        modeExt             = (header >> 4) & 3;
        //extension         = (header >> 8) & 1;
        //copyright         = (header >> 3) & 1;
        //original          = (header >> 2) & 1;
        //emphasis          = header & 3;
        numChannels         = (mode == 3) ? 1 : 2;

        static constexpr int frameSizes[2][3][16] =
        {
            { { 0, 32, 64, 96, 128, 160, 192, 224, 256, 288, 320, 352, 384, 416, 448 },
              { 0, 32, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320, 384 },
              { 0, 32, 40, 48, 56, 64, 80, 96, 112, 128, 160, 192, 224, 256, 320 } },

            { { 0, 32, 48, 56, 64, 80, 96, 112, 128, 144, 160, 176, 192, 224, 256 },
              { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 },
              { 0, 8, 16, 24, 32, 40, 48, 56, 64, 80, 96, 112, 128, 144, 160 } }
        };

        if (bitrateIndex == 0)
        {
            jassertfalse; // This means the file is using "free format". Apparently very few decoders
                          // support this mode, and this one certainly doesn't handle it correctly!
            frameSize = 0;
            return ParseSuccessful::no;
        }

        switch (layer)
        {
            case 1: frameSize = (((frameSizes[lsf][0][bitrateIndex] * 12000) / getFrequency() + padding) * 4) - 4; break;
            case 2: frameSize = (frameSizes[lsf][1][bitrateIndex] * 144000)  / getFrequency() + (padding - 4); break;
            case 3: frameSize = (bitrateIndex == 0) ? 0 : ((frameSizes[lsf][2][bitrateIndex] * 144000) / (getFrequency() << lsf) + (padding - 4)); break;
            default: break;
        }

        return ParseSuccessful::yes;
    }

    int layer, frameSize, numChannels, single;
    int lsf;     // 0 = mpeg-1, 1 = mpeg-2/LSF
    bool mpeg25; // true = mpeg-2.5, false = mpeg-1/2
    bool crc16FollowsHeader;
    int bitrateIndex, sampleRateIndex, padding;
    int mode, modeExt, layer2SubBandLimit;
    enum { downSampleLimit = 32 };
    const AllocationTable* allocationTable;
};

//==============================================================================
struct Constants
{
    Constants()
    {
        cosTables[0] = cos64; cosTables[1] = cos32; cosTables[2] = cos16; cosTables[3] = cos8; cosTables[4] = cos4;
        initDecodeTables();
        initLayer2Tables();
        initLayer3Tables();
    }

    const uint8* getGroupTable (const int16 d1, const uint32 index) const noexcept
    {
        switch (d1)
        {
            case 3:   return &group3tab[3 * jmin (index, 3u * 3u * 3u)];
            case 5:   return &group5tab[3 * jmin (index, 5u * 5u * 5u)];
            case 9:   return &group9tab[3 * jmin (index, 9u * 9u * 9u)];
            default:  break;
        }

        static constexpr uint8 dummy[] = { 0, 0, 0 };
        return dummy;
    }

    float muls[27][64];
    float nToThe4Over3[8207];
    float antiAliasingCa[8], antiAliasingCs[8];
    float win[4][36];
    float win1[4][36];
    float powToGains[256 + 118 + 4];
    int longLimit[9][23];
    int shortLimit[9][14];
    float tan1_1[16], tan2_1[16], tan1_2[16], tan2_2[16];
    float pow1_1[2][16], pow2_1[2][16], pow1_2[2][16], pow2_2[2][16];
    int* map[9][3];
    int* mapEnd[9][3];
    uint32 nLength2[512];
    uint32 iLength2[256];
    float decodeWin[512 + 32];
    float* cosTables[5];

private:
    int mapbuf0[9][152];
    int mapbuf1[9][156];
    int mapbuf2[9][44];
    float cos64[16], cos32[8], cos16[4], cos8[2], cos4[1];
    uint8 group3tab[32 * 3];
    uint8 group5tab[128 * 3];
    uint8 group9tab[1024 * 3];

    void initDecodeTables()
    {
        int i, j, scaleval = -1;
        float* table = decodeWin;

        for (i = 0; i < 5; ++i)
        {
            int kr = 0x10 >> i;
            int divv = 0x40 >> i;
            float* costab = cosTables[i];

            for (int k = 0; k < kr; ++k)
                costab[k] = (float) (1.0 / (2.0 * std::cos (MathConstants<double>::pi * (k * 2 + 1) / divv)));
        }

        for (i = 0, j = 0; i < 256; ++i, ++j, table += 32)
        {
            if (table < decodeWin + 512 + 16)
                table[16] = table[0] = (float) (decodeWindow[j] * scaleval);
            if (i % 32 == 31)
                table -= 1023;
            if (i % 64 == 63)
                scaleval = -scaleval;
        }

        for (; i < 512; ++i, --j, table += 32)
        {
            if (table < decodeWin + 512 + 16)
                table[16] = table[0] = (float) (decodeWindow[j] * scaleval);

            if (i % 32 == 31) table -= 1023;
            if (i % 64 == 63) scaleval = -scaleval;
        }
    }

    void initLayer2Tables()
    {
        static const uint8 base[3][9] =
        {
            { 1, 0, 2 },
            { 17, 18, 0, 19, 20 },
            { 21, 1, 22, 23, 0, 24, 25, 2, 26 }
        };

        static constexpr int tableLengths[] = { 3, 5, 9 };
        static uint8* tables[] = { group3tab, group5tab, group9tab };

        for (int i = 0; i < 3; ++i)
        {
            uint8* table = tables[i];
            const int len = tableLengths[i];

            for (int j = 0; j < len; ++j)
                for (int k = 0; k < len; ++k)
                    for (int l = 0; l < len; ++l)
                    {
                        *table++ = base[i][l];
                        *table++ = base[i][k];
                        *table++ = base[i][j];
                    }
        }

        for (int k = 0; k < 27; ++k)
        {
            static constexpr double multipliers[] =
            {
                0, -2.0 / 3.0, 2.0 / 3.0, 2.0 / 7.0, 2.0 / 15.0, 2.0 / 31.0, 2.0 / 63.0, 2.0 / 127.0, 2.0 / 255.0,
                2.0 / 511.0, 2.0 / 1023.0, 2.0 / 2047.0, 2.0 / 4095.0, 2.0 / 8191.0, 2.0 / 16383.0, 2.0 / 32767.0, 2.0 / 65535.0,
                -4.0 / 5.0, -2.0 / 5.0, 2.0 / 5.0, 4.0 / 5.0, -8.0 / 9.0, -4.0 / 9.0, -2.0 / 9.0, 2.0 / 9.0, 4.0 / 9.0, 8.0 / 9.0
            };

            float* table = muls[k];
            for (int j = 3, i = 0; i < 63; ++i, --j)
                *table++ = (float) (multipliers[k] * std::pow (2.0, j / 3.0));
            *table++ = 0;
        }
    }

    void initLayer3Tables()
    {
        int i, j;
        for (i = -256; i < 118 + 4; ++i)
            powToGains[i + 256] = (float) std::pow (2.0, -0.25 * (i + 210));

        for (i = 0; i < 8207; ++i)
            nToThe4Over3[i] = (float) std::pow ((double) i, 4.0 / 3.0);

        for (i = 0; i < 8; ++i)
        {
            static constexpr double Ci[] = { -0.6, -0.535, -0.33, -0.185, -0.095, -0.041, -0.0142, -0.0037 };
            const double sq = sqrt (1.0 + Ci[i] * Ci[i]);
            antiAliasingCs[i] = (float) (1.0 / sq);
            antiAliasingCa[i] = (float) (Ci[i] / sq);
        }

        for (i = 0; i < 18; ++i)
        {
            win[0][i]      = win[1][i]      = (float) (0.5 * std::sin (MathConstants<double>::pi / 72.0 * (2 * i + 1))        / std::cos (MathConstants<double>::pi * (2 * i + 19)        / 72.0));
            win[0][i + 18] = win[3][i + 18] = (float) (0.5 * std::sin (MathConstants<double>::pi / 72.0 * (2 * (i + 18) + 1)) / std::cos (MathConstants<double>::pi * (2 * (i + 18) + 19) / 72.0));
        }

        const double piOver72 = MathConstants<double>::pi / 72.0;

        for (i = 0; i < 6; ++i)
        {
            win[1][i + 18] = (float) (0.5 / std::cos (piOver72 * (2 * (i + 18) + 19)));
            win[3][i + 12] = (float) (0.5 / std::cos (piOver72 * (2 * (i + 12) + 19)));
            win[1][i + 24] = (float) (0.5 * std::sin (MathConstants<double>::pi / 24.0 * (2 * i + 13)) / std::cos (piOver72 * (2 * (i + 24) + 19)));
            win[1][i + 30] = win[3][i] = 0;
            win[3][i + 6]  = (float) (0.5 * std::sin (MathConstants<double>::pi / 24.0 * (2 * i + 1)) / std::cos (piOver72 * (2 * (i + 6) + 19)));
        }

        for (i = 0; i < 12; ++i)
            win[2][i] = (float) (0.5 * std::sin (MathConstants<double>::pi / 24.0 * (2 * i + 1)) / std::cos (MathConstants<double>::pi * (2 * i + 7) / 24.0));

        for (j = 0; j < 4; ++j)
        {
            static constexpr int len[4] = { 36, 36, 12, 36 };
            for (i = 0; i < len[j]; i += 2)   win1[j][i] =  win[j][i];
            for (i = 1; i < len[j]; i += 2)   win1[j][i] = -win[j][i];
        }

        const double sqrt2 = 1.41421356237309504880168872420969808;

        for (i = 0; i < 16; ++i)
        {
            const double t = std::tan (i * MathConstants<double>::pi / 12.0);
            tan1_1[i] = (float) (t / (1.0 + t));
            tan2_1[i] = (float) (1.0 / (1.0 + t));
            tan1_2[i] = (float) (sqrt2 * t / (1.0 + t));
            tan2_2[i] = (float) (sqrt2 / (1.0 + t));

            for (j = 0; j < 2; ++j)
            {
                double p1 = 1.0, p2 = 1.0;

                if (i > 0)
                {
                    const double base = std::pow (2.0, -0.25 * (j + 1));

                    if (i & 1)
                        p1 = std::pow (base, (i + 1) * 0.5);
                    else
                        p2 = std::pow (base, i * 0.5);
                }

                pow1_1[j][i] = (float) p1;
                pow2_1[j][i] = (float) p2;
                pow1_2[j][i] = (float) (sqrt2 * p1);
                pow2_2[j][i] = (float) (sqrt2 * p2);
            }
        }

        for (j = 0; j < 9; ++j)
        {
            const BandInfoStruct& bi = bandInfo[j];
            int cb;
            int* mp = map[j][0] = mapbuf0[j];
            const int16* bdf = bi.longDiff;

            for (i = 0, cb = 0; cb < 8; ++cb, i += *bdf++)
            {
                *mp++ = (*bdf) >> 1;
                *mp++ = i;
                *mp++ = 3;
                *mp++ = cb;
            }
            bdf = bi.shortDiff + 3;

            for (cb = 3; cb < 13; ++cb)
            {
                const int l = (*bdf++) >> 1;

                for (int lwin = 0; lwin < 3; ++lwin)
                {
                    *mp++ = l;
                    *mp++ = i + lwin;
                    *mp++ = lwin;
                    *mp++ = cb;
                }
                i += 6 * l;
            }

            mapEnd[j][0] = mp;
            mp = map[j][1] = mapbuf1[j];
            bdf = bi.shortDiff;

            for (i = 0, cb = 0; cb < 13; ++cb)
            {
                const int l = (*bdf++) >> 1;
                for (int lwin = 0; lwin < 3; ++lwin)
                {
                    *mp++ = l;
                    *mp++ = i + lwin;
                    *mp++ = lwin;
                    *mp++ = cb;
                }
                i += 6 * l;
            }
            mapEnd[j][1] = mp;

            mp = map[j][2] = mapbuf2[j];
            bdf = bi.longDiff;
            for (cb = 0; cb < 22; ++cb)
            {
                *mp++ = (*bdf++) >> 1;
                *mp++ = cb;
            }
            mapEnd[j][2] = mp;

        }

        for (j = 0; j < 9; ++j)
        {
            for (i = 0; i < 23; ++i)    longLimit[j][i]  = jmin (32, (bandInfo[j].longIndex[i] - 1 + 8) / 18 + 1);
            for (i = 0; i < 14; ++i)    shortLimit[j][i] = jmin (32, (bandInfo[j].shortIndex[i] - 1) / 18 + 1);
        }

        for (i = 0; i < 5; ++i)
            for (j = 0; j < 6; ++j)
                for (int k = 0; k < 6; ++k)
                {
                    const int n = k + j * 6 + i * 36;
                    iLength2[n] = (unsigned int) (i | (j << 3) | (k << 6) | (3 << 12));
                }

        for (i = 0; i < 4; ++i)
            for (j = 0; j < 4; ++j)
                for (int k = 0; k < 4; ++k)
                {
                    const int n = k + j * 4 + i * 16;
                    iLength2[n + 180] = (unsigned int) (i | (j << 3) | (k << 6) | (4 << 12));
                }

        for (i = 0; i < 4; ++i)
            for (j = 0; j < 3; ++j)
            {
                const int n = j + i * 3;
                iLength2[n + 244] = (unsigned int) (i | (j << 3) | (5 << 12));
                nLength2[n + 500] = (unsigned int) (i | (j << 3) | (2 << 12) | (1 << 15));
            }

        for (i = 0; i < 5; ++i)
            for (j = 0; j < 5; ++j)
                for (int k = 0; k < 4; ++k)
                    for (int l = 0; l < 4; ++l)
                    {
                        const int n = l + k * 4 + j * 16 + i * 80;
                        nLength2[n] = (unsigned int) (i | (j << 3) | (k << 6) | (l << 9) | (0 << 12));
                    }

        for (i = 0; i < 5; ++i)
            for (j = 0; j < 5; ++j)
                for (int k = 0; k < 4; ++k)
                {
                    const int n = k + j * 4 + i * 20;
                    nLength2[n + 400] = (unsigned int) (i | (j << 3) | (k << 6) | (1 << 12));
                }
    }
};

static const Constants constants;


//==============================================================================
struct Layer3SideInfo
{
    struct Info
    {
        void doAntialias (float xr[32][18]) const noexcept
        {
            float* xr1 = xr[1];
            int sb;

            if (blockType == 2)
            {
                if (mixedBlockFlag == 0)
                    return;

                sb = 1;
            }
            else
                sb = (int) maxb - 1;

            for (; sb != 0; --sb, xr1 += 10)
            {
                auto* cs = constants.antiAliasingCs;
                auto* ca = constants.antiAliasingCa;
                auto* xr2 = xr1;

                for (int ss = 7; ss >= 0; --ss)
                {
                    const float bu = *--xr2, bd = *xr1;
                    *xr2   = (bu * *cs)   - (bd * *ca);
                    *xr1++ = (bd * *cs++) + (bu * *ca++);
                }
            }
        }

        void doIStereo (float xrBuffer[2][32][18], const int* scaleFactors,
                        int sampleRate, bool msStereo, int lsf) const noexcept
        {
            float (*xr) [32 * 18] = (float (*) [32 * 18]) xrBuffer;
            auto& bi = bandInfo[sampleRate];
            const float* tabl1, *tabl2;

            if (lsf != 0)
            {
                auto p = scaleFactorCompression & 1;

                if (msStereo)
                {
                    tabl1 = constants.pow1_2[p];
                    tabl2 = constants.pow2_2[p];
                }
                else
                {
                    tabl1 = constants.pow1_1[p];
                    tabl2 = constants.pow2_1[p];
                }
            }
            else
            {
                if (msStereo)
                {
                    tabl1 = constants.tan1_2;
                    tabl2 = constants.tan2_2;
                }
                else
                {
                    tabl1 = constants.tan1_1;
                    tabl2 = constants.tan2_1;
                }
            }

            if (blockType == 2)
            {
                bool doL = mixedBlockFlag != 0;

                for (uint32 lwin = 0; lwin < 3; ++lwin)
                {
                    uint32 sfb = maxBand[lwin];
                    doL = doL && (sfb <= 3);

                    for (; sfb < 12; ++sfb)
                    {
                        auto p = scaleFactors[sfb * 3 + lwin - mixedBlockFlag];

                        if (p != 7)
                        {
                            auto t1 = tabl1[p];
                            auto t2 = tabl2[p];
                            int sb = bi.shortDiff[sfb];
                            auto index = (uint32) sb + lwin;

                            for (; sb > 0; --sb, index += 3)
                            {
                                float v = xr[0][index];
                                xr[0][index] = v * t1;
                                xr[1][index] = v * t2;
                            }
                        }
                    }

                    auto p = scaleFactors[11 * 3 + lwin - mixedBlockFlag];

                    if (p != 7)
                    {
                        auto t1 = tabl1[p];
                        auto t2 = tabl2[p];
                        int sb = bi.shortDiff[12];
                        auto index = (uint32) sb + lwin;

                        for (; sb > 0; --sb, index += 3)
                        {
                            float v = xr[0][index];
                            xr[0][index] = v * t1;
                            xr[1][index] = v * t2;
                        }
                    }
                }

                if (doL)
                {
                    int index = bi.longIndex[maxBandl];

                    for (uint32 sfb = maxBandl; sfb < 8; ++sfb)
                    {
                        int sb = bi.longDiff[sfb];
                        auto p = scaleFactors[sfb];

                        if (p != 7)
                        {
                            auto t1 = tabl1[p];
                            auto t2 = tabl2[p];

                            for (; sb > 0; --sb, ++index)
                            {
                                float v = xr[0][index];
                                xr[0][index] = v * t1;
                                xr[1][index] = v * t2;
                            }
                        }
                        else
                            index += sb;
                    }
                }
            }
            else
            {
                int index = bi.longIndex[maxBandl];

                for (uint32 sfb = maxBandl; sfb < 21; ++sfb)
                {
                    int sb = bi.longDiff[sfb];
                    auto p = scaleFactors[sfb];

                    if (p != 7)
                    {
                        auto t1 = tabl1[p];
                        auto t2 = tabl2[p];

                        for (; sb > 0; --sb, ++index)
                        {
                            const float v = xr[0][index];
                            xr[0][index] = v * t1;
                            xr[1][index] = v * t2;
                        }
                    }
                    else
                        index += sb;
                }

                auto p = scaleFactors[20];

                if (p != 7)
                {
                    auto t1 = tabl1[p], t2 = tabl2[p];

                    for (int sb = bi.longDiff[21]; sb > 0; --sb, ++index)
                    {
                        const float v = xr[0][index];
                        xr[0][index] = v * t1;
                        xr[1][index] = v * t2;
                    }
                }
            }
        }

        int scfsi;
        uint32 part2_3Length, bigValues;
        uint32 scaleFactorCompression, blockType, mixedBlockFlag;
        uint32 tableSelect[3];
        uint32 maxBand[3];
        uint32 maxBandl, maxb, region1Start, region2Start;
        uint32 preflag, scaleFactorScale, count1TableSelect;
        const float* fullGain[3];
        const float* pow2gain;
    };

    struct InfoPair { Info gr[2]; };
    InfoPair ch[2];

    uint32 mainDataStart, privateBits;
};

//==============================================================================
namespace DCT
{
    enum { subBandLimit = 32 };
    static constexpr float cos6_1  = 0.866025388f;
    static constexpr float cos6_2  = 0.5f;
    static constexpr float cos9[]  = { 1.0f, 0.98480773f, 0.939692616f, 0.866025388f, 0.766044438f, 0.642787635f, 0.5f, 0.342020154f, 0.173648179f };
    static constexpr float cos36[] = { 0.501909912f, 0.517638087f, 0.551688969f, 0.610387266f, 0.707106769f, 0.871723413f, 1.18310082f, 1.93185163f, 5.73685646f };
    static constexpr float cos12[] = { 0.517638087f, 0.707106769f, 1.93185163f };

    inline void dct36_0 (int v, float* ts, float* out1, float* out2, const float* wintab, float sum0, float sum1) noexcept
    {
        auto tmp = sum0 + sum1;
        out2[9 + v] = tmp * wintab[27 + v];
        out2[8 - v] = tmp * wintab[26 - v];
        sum0 -= sum1;
        ts[subBandLimit * (8 - v)] = out1[8 - v] + sum0 * wintab[8 - v];
        ts[subBandLimit * (9 + v)] = out1[9 + v] + sum0 * wintab[9 + v];
    }

    inline void dct36_12 (int v1, int v2, float* ts, float* out1, float* out2, const float* wintab,
                          float tmp1a, float tmp1b, float tmp2a, float tmp2b) noexcept
    {
        dct36_0 (v1, ts, out1, out2, wintab, tmp1a + tmp2a, (tmp1b + tmp2b) * cos36[v1]);
        dct36_0 (v2, ts, out1, out2, wintab, tmp2a - tmp1a, (tmp2b - tmp1b) * cos36[v2]);
    }

    static void dct36 (float* in, float* out1, float* out2, const float* wintab, float* ts) noexcept
    {
        in[17] += in[16]; in[16] += in[15]; in[15] += in[14]; in[14] += in[13]; in[13] += in[12];
        in[12] += in[11]; in[11] += in[10]; in[10] += in[9];  in[9]  += in[8];  in[8]  += in[7];
        in[7]  += in[6];  in[6]  += in[5];  in[5]  += in[4];  in[4]  += in[3];  in[3]  += in[2];
        in[2]  += in[1];  in[1]  += in[0];  in[17] += in[15]; in[15] += in[13]; in[13] += in[11];
        in[11] += in[9];  in[9]  += in[7];  in[7]  += in[5];  in[5]  += in[3];  in[3]  += in[1];

        auto ta33 = in[6]  * cos9[3];
        auto ta66 = in[12] * cos9[6];
        auto tb33 = in[7]  * cos9[3];
        auto tb66 = in[13] * cos9[6];

        dct36_12 (0, 8, ts, out1, out2, wintab,
                  in[2] * cos9[1] + ta33 + in[10] * cos9[5] + in[14] * cos9[7],
                  in[3] * cos9[1] + tb33 + in[11] * cos9[5] + in[15] * cos9[7],
                  in[0] + in[4] * cos9[2] + in[8] * cos9[4] + ta66 + in[16] * cos9[8],
                  in[1] + in[5] * cos9[2] + in[9] * cos9[4] + tb66 + in[17] * cos9[8]);

        dct36_12 (1, 7, ts, out1, out2, wintab,
                  (in[2] - in[10] - in[14]) * cos9[3],
                  (in[3] - in[11] - in[15]) * cos9[3],
                  (in[4] - in[8] - in[16]) * cos9[6] - in[12] + in[0],
                  (in[5] - in[9] - in[17]) * cos9[6] - in[13] + in[1]);

        dct36_12 (2, 6, ts, out1, out2, wintab,
                  in[2] * cos9[5] - ta33 - in[10] * cos9[7] + in[14] * cos9[1],
                  in[3] * cos9[5] - tb33 - in[11] * cos9[7] + in[15] * cos9[1],
                  in[0] - in[4] * cos9[8] - in[8] * cos9[2] + ta66 + in[16] * cos9[4],
                  in[1] - in[5] * cos9[8] - in[9] * cos9[2] + tb66 + in[17] * cos9[4]);

        dct36_12 (3, 5, ts, out1, out2, wintab,
                  in[2] * cos9[7] - ta33 + in[10] * cos9[1] - in[14] * cos9[5],
                  in[3] * cos9[7] - tb33 + in[11] * cos9[1] - in[15] * cos9[5],
                  in[0] - in[4] * cos9[4] + in[8] * cos9[8] + ta66 - in[16] * cos9[2],
                  in[1] - in[5] * cos9[4] + in[9] * cos9[8] + tb66 - in[17] * cos9[2]);

        dct36_0 (4, ts, out1, out2, wintab,
                 in[0] - in[4] + in[8] - in[12] + in[16],
                 (in[1] - in[5] + in[9] - in[13] + in[17]) * cos36[4]);
    }

    struct DCT12Inputs
    {
        float in0, in1, in2, in3, in4, in5;

        inline DCT12Inputs (const float* in) noexcept
        {
            in5 = in[5 * 3] + (in4 = in[4 * 3]);
            in4 += (in3 = in[3 * 3]);
            in3 += (in2 = in[2 * 3]);
            in2 += (in1 = in[1 * 3]);
            in1 += (in0 = in[0 * 3]);
            in5 += in3; in3 += in1;
            in2 *= cos6_1;
            in3 *= cos6_1;
        }

        inline void process() noexcept
        {
            in0 += in4 * cos6_2;
            in4 = in0 + in2; in0 -= in2;
            in1 += in5 * cos6_2;
            in5 = (in1 + in3) * cos12[0];
            in1 = (in1 - in3) * cos12[2];
            in3 = in4 + in5; in4 -= in5;
            in2 = in0 + in1; in0 -= in1;
        }
    };

    static void dct12 (const float* in, float* out1, float* out2, const float* wi, float* ts) noexcept
    {
        {
            ts[0] = out1[0];
            ts[subBandLimit * 1] = out1[1];
            ts[subBandLimit * 2] = out1[2];
            ts[subBandLimit * 3] = out1[3];
            ts[subBandLimit * 4] = out1[4];
            ts[subBandLimit * 5] = out1[5];

            DCT12Inputs inputs (in);

            {
                auto tmp1 = (inputs.in0 - inputs.in4);
                auto tmp2 = (inputs.in1 - inputs.in5) * cos12[1];
                auto tmp0 = tmp1 + tmp2;
                tmp1 -= tmp2;

                ts[16 * subBandLimit] = out1[16] + tmp0 * wi[10];
                ts[13 * subBandLimit] = out1[13] + tmp0 * wi[7];
                ts[7  * subBandLimit] = out1[7]  + tmp1 * wi[1];
                ts[10 * subBandLimit] = out1[10] + tmp1 * wi[4];
            }

            inputs.process();

            ts[17 * subBandLimit] = out1[17] + inputs.in2 * wi[11];
            ts[12 * subBandLimit] = out1[12] + inputs.in2 * wi[6];
            ts[14 * subBandLimit] = out1[14] + inputs.in3 * wi[8];
            ts[15 * subBandLimit] = out1[15] + inputs.in3 * wi[9];

            ts[6  * subBandLimit] = out1[6]  + inputs.in0 * wi[0];
            ts[11 * subBandLimit] = out1[11] + inputs.in0 * wi[5];
            ts[8  * subBandLimit] = out1[8]  + inputs.in4 * wi[2];
            ts[9  * subBandLimit] = out1[9]  + inputs.in4 * wi[3];
        }

        {
            DCT12Inputs inputs (++in);
            auto tmp1 = (inputs.in0 - inputs.in4);
            auto tmp2 = (inputs.in1 - inputs.in5) * cos12[1];
            auto tmp0 = tmp1 + tmp2;
            tmp1 -= tmp2;
            out2[4] = tmp0 * wi[10];
            out2[1] = tmp0 * wi[7];
            ts[13 * subBandLimit] += tmp1 * wi[1];
            ts[16 * subBandLimit] += tmp1 * wi[4];

            inputs.process();

            out2[5] = inputs.in2 * wi[11];
            out2[0] = inputs.in2 * wi[6];
            out2[2] = inputs.in3 * wi[8];
            out2[3] = inputs.in3 * wi[9];
            ts[12 * subBandLimit] += inputs.in0 * wi[0];
            ts[17 * subBandLimit] += inputs.in0 * wi[5];
            ts[14 * subBandLimit] += inputs.in4 * wi[2];
            ts[15 * subBandLimit] += inputs.in4 * wi[5 - 2];
        }

        {
            DCT12Inputs inputs (++in);
            out2[12] = out2[13] = out2[14] = out2[15] = out2[16] = out2[17] = 0;

            auto tmp1 = (inputs.in0 - inputs.in4);
            auto tmp2 = (inputs.in1 - inputs.in5) * cos12[1];
            auto tmp0 = tmp1 + tmp2;
            tmp1 -= tmp2;

            out2[10] = tmp0 * wi[10];
            out2[7]  = tmp0 * wi[7];
            out2[1] += tmp1 * wi[1];
            out2[4] += tmp1 * wi[4];

            inputs.process();

            out2[11] = inputs.in2 * wi[11];
            out2[6]  = inputs.in2 * wi[6];
            out2[8]  = inputs.in3 * wi[8];
            out2[9]  = inputs.in3 * wi[9];
            out2[0] += inputs.in0 * wi[0];
            out2[5] += inputs.in0 * wi[5];
            out2[2] += inputs.in4 * wi[2];
            out2[3] += inputs.in4 * wi[3];
        }
    }

    static void dct64 (float* out0, float* out1, const float* samples) noexcept
    {
        float b1[32], b2[32];

        {
            auto* costab = constants.cosTables[0];
            b1[0x00] = samples[0x00] + samples[0x1F];   b1[0x1F] = (samples[0x00] - samples[0x1F]) * costab[0x0];
            b1[0x01] = samples[0x01] + samples[0x1E];   b1[0x1E] = (samples[0x01] - samples[0x1E]) * costab[0x1];
            b1[0x02] = samples[0x02] + samples[0x1D];   b1[0x1D] = (samples[0x02] - samples[0x1D]) * costab[0x2];
            b1[0x03] = samples[0x03] + samples[0x1C];   b1[0x1C] = (samples[0x03] - samples[0x1C]) * costab[0x3];
            b1[0x04] = samples[0x04] + samples[0x1B];   b1[0x1B] = (samples[0x04] - samples[0x1B]) * costab[0x4];
            b1[0x05] = samples[0x05] + samples[0x1A];   b1[0x1A] = (samples[0x05] - samples[0x1A]) * costab[0x5];
            b1[0x06] = samples[0x06] + samples[0x19];   b1[0x19] = (samples[0x06] - samples[0x19]) * costab[0x6];
            b1[0x07] = samples[0x07] + samples[0x18];   b1[0x18] = (samples[0x07] - samples[0x18]) * costab[0x7];
            b1[0x08] = samples[0x08] + samples[0x17];   b1[0x17] = (samples[0x08] - samples[0x17]) * costab[0x8];
            b1[0x09] = samples[0x09] + samples[0x16];   b1[0x16] = (samples[0x09] - samples[0x16]) * costab[0x9];
            b1[0x0A] = samples[0x0A] + samples[0x15];   b1[0x15] = (samples[0x0A] - samples[0x15]) * costab[0xA];
            b1[0x0B] = samples[0x0B] + samples[0x14];   b1[0x14] = (samples[0x0B] - samples[0x14]) * costab[0xB];
            b1[0x0C] = samples[0x0C] + samples[0x13];   b1[0x13] = (samples[0x0C] - samples[0x13]) * costab[0xC];
            b1[0x0D] = samples[0x0D] + samples[0x12];   b1[0x12] = (samples[0x0D] - samples[0x12]) * costab[0xD];
            b1[0x0E] = samples[0x0E] + samples[0x11];   b1[0x11] = (samples[0x0E] - samples[0x11]) * costab[0xE];
            b1[0x0F] = samples[0x0F] + samples[0x10];   b1[0x10] = (samples[0x0F] - samples[0x10]) * costab[0xF];
        }

        {
            auto* costab = constants.cosTables[1];
            b2[0x00] = b1[0x00] + b1[0x0F];   b2[0x0F] = (b1[0x00] - b1[0x0F]) * costab[0];
            b2[0x01] = b1[0x01] + b1[0x0E];   b2[0x0E] = (b1[0x01] - b1[0x0E]) * costab[1];
            b2[0x02] = b1[0x02] + b1[0x0D];   b2[0x0D] = (b1[0x02] - b1[0x0D]) * costab[2];
            b2[0x03] = b1[0x03] + b1[0x0C];   b2[0x0C] = (b1[0x03] - b1[0x0C]) * costab[3];
            b2[0x04] = b1[0x04] + b1[0x0B];   b2[0x0B] = (b1[0x04] - b1[0x0B]) * costab[4];
            b2[0x05] = b1[0x05] + b1[0x0A];   b2[0x0A] = (b1[0x05] - b1[0x0A]) * costab[5];
            b2[0x06] = b1[0x06] + b1[0x09];   b2[0x09] = (b1[0x06] - b1[0x09]) * costab[6];
            b2[0x07] = b1[0x07] + b1[0x08];   b2[0x08] = (b1[0x07] - b1[0x08]) * costab[7];
            b2[0x10] = b1[0x10] + b1[0x1F];   b2[0x1F] = (b1[0x1F] - b1[0x10]) * costab[0];
            b2[0x11] = b1[0x11] + b1[0x1E];   b2[0x1E] = (b1[0x1E] - b1[0x11]) * costab[1];
            b2[0x12] = b1[0x12] + b1[0x1D];   b2[0x1D] = (b1[0x1D] - b1[0x12]) * costab[2];
            b2[0x13] = b1[0x13] + b1[0x1C];   b2[0x1C] = (b1[0x1C] - b1[0x13]) * costab[3];
            b2[0x14] = b1[0x14] + b1[0x1B];   b2[0x1B] = (b1[0x1B] - b1[0x14]) * costab[4];
            b2[0x15] = b1[0x15] + b1[0x1A];   b2[0x1A] = (b1[0x1A] - b1[0x15]) * costab[5];
            b2[0x16] = b1[0x16] + b1[0x19];   b2[0x19] = (b1[0x19] - b1[0x16]) * costab[6];
            b2[0x17] = b1[0x17] + b1[0x18];   b2[0x18] = (b1[0x18] - b1[0x17]) * costab[7];
        }

        {
            auto* costab = constants.cosTables[2];
            b1[0x00] = b2[0x00] + b2[0x07];   b1[0x07] = (b2[0x00] - b2[0x07]) * costab[0];
            b1[0x01] = b2[0x01] + b2[0x06];   b1[0x06] = (b2[0x01] - b2[0x06]) * costab[1];
            b1[0x02] = b2[0x02] + b2[0x05];   b1[0x05] = (b2[0x02] - b2[0x05]) * costab[2];
            b1[0x03] = b2[0x03] + b2[0x04];   b1[0x04] = (b2[0x03] - b2[0x04]) * costab[3];
            b1[0x08] = b2[0x08] + b2[0x0F];   b1[0x0F] = (b2[0x0F] - b2[0x08]) * costab[0];
            b1[0x09] = b2[0x09] + b2[0x0E];   b1[0x0E] = (b2[0x0E] - b2[0x09]) * costab[1];
            b1[0x0A] = b2[0x0A] + b2[0x0D];   b1[0x0D] = (b2[0x0D] - b2[0x0A]) * costab[2];
            b1[0x0B] = b2[0x0B] + b2[0x0C];   b1[0x0C] = (b2[0x0C] - b2[0x0B]) * costab[3];
            b1[0x10] = b2[0x10] + b2[0x17];   b1[0x17] = (b2[0x10] - b2[0x17]) * costab[0];
            b1[0x11] = b2[0x11] + b2[0x16];   b1[0x16] = (b2[0x11] - b2[0x16]) * costab[1];
            b1[0x12] = b2[0x12] + b2[0x15];   b1[0x15] = (b2[0x12] - b2[0x15]) * costab[2];
            b1[0x13] = b2[0x13] + b2[0x14];   b1[0x14] = (b2[0x13] - b2[0x14]) * costab[3];
            b1[0x18] = b2[0x18] + b2[0x1F];   b1[0x1F] = (b2[0x1F] - b2[0x18]) * costab[0];
            b1[0x19] = b2[0x19] + b2[0x1E];   b1[0x1E] = (b2[0x1E] - b2[0x19]) * costab[1];
            b1[0x1A] = b2[0x1A] + b2[0x1D];   b1[0x1D] = (b2[0x1D] - b2[0x1A]) * costab[2];
            b1[0x1B] = b2[0x1B] + b2[0x1C];   b1[0x1C] = (b2[0x1C] - b2[0x1B]) * costab[3];
        }

        {
            auto cos0 = constants.cosTables[3][0];
            auto cos1 = constants.cosTables[3][1];
            b2[0x00] = b1[0x00] + b1[0x03];   b2[0x03] = (b1[0x00] - b1[0x03]) * cos0;
            b2[0x01] = b1[0x01] + b1[0x02];   b2[0x02] = (b1[0x01] - b1[0x02]) * cos1;
            b2[0x04] = b1[0x04] + b1[0x07];   b2[0x07] = (b1[0x07] - b1[0x04]) * cos0;
            b2[0x05] = b1[0x05] + b1[0x06];   b2[0x06] = (b1[0x06] - b1[0x05]) * cos1;
            b2[0x08] = b1[0x08] + b1[0x0B];   b2[0x0B] = (b1[0x08] - b1[0x0B]) * cos0;
            b2[0x09] = b1[0x09] + b1[0x0A];   b2[0x0A] = (b1[0x09] - b1[0x0A]) * cos1;
            b2[0x0C] = b1[0x0C] + b1[0x0F];   b2[0x0F] = (b1[0x0F] - b1[0x0C]) * cos0;
            b2[0x0D] = b1[0x0D] + b1[0x0E];   b2[0x0E] = (b1[0x0E] - b1[0x0D]) * cos1;
            b2[0x10] = b1[0x10] + b1[0x13];   b2[0x13] = (b1[0x10] - b1[0x13]) * cos0;
            b2[0x11] = b1[0x11] + b1[0x12];   b2[0x12] = (b1[0x11] - b1[0x12]) * cos1;
            b2[0x14] = b1[0x14] + b1[0x17];   b2[0x17] = (b1[0x17] - b1[0x14]) * cos0;
            b2[0x15] = b1[0x15] + b1[0x16];   b2[0x16] = (b1[0x16] - b1[0x15]) * cos1;
            b2[0x18] = b1[0x18] + b1[0x1B];   b2[0x1B] = (b1[0x18] - b1[0x1B]) * cos0;
            b2[0x19] = b1[0x19] + b1[0x1A];   b2[0x1A] = (b1[0x19] - b1[0x1A]) * cos1;
            b2[0x1C] = b1[0x1C] + b1[0x1F];   b2[0x1F] = (b1[0x1F] - b1[0x1C]) * cos0;
            b2[0x1D] = b1[0x1D] + b1[0x1E];   b2[0x1E] = (b1[0x1E] - b1[0x1D]) * cos1;
        }

        {
            auto cos0 = constants.cosTables[4][0];
            b1[0x00] = b2[0x00] + b2[0x01];   b1[0x01] = (b2[0x00] - b2[0x01]) * cos0;
            b1[0x02] = b2[0x02] + b2[0x03];   b1[0x03] = (b2[0x03] - b2[0x02]) * cos0;  b1[0x02] += b1[0x03];
            b1[0x04] = b2[0x04] + b2[0x05];   b1[0x05] = (b2[0x04] - b2[0x05]) * cos0;
            b1[0x06] = b2[0x06] + b2[0x07];   b1[0x07] = (b2[0x07] - b2[0x06]) * cos0;
            b1[0x06] += b1[0x07];   b1[0x04] += b1[0x06];  b1[0x06] += b1[0x05]; b1[0x05] += b1[0x07];
            b1[0x08] = b2[0x08] + b2[0x09];   b1[0x09] = (b2[0x08] - b2[0x09]) * cos0;
            b1[0x0A] = b2[0x0A] + b2[0x0B];   b1[0x0B] = (b2[0x0B] - b2[0x0A]) * cos0;  b1[0x0A] += b1[0x0B];
            b1[0x0C] = b2[0x0C] + b2[0x0D];   b1[0x0D] = (b2[0x0C] - b2[0x0D]) * cos0;
            b1[0x0E] = b2[0x0E] + b2[0x0F];   b1[0x0F] = (b2[0x0F] - b2[0x0E]) * cos0;
            b1[0x0E] += b1[0x0F];   b1[0x0C] += b1[0x0E];  b1[0x0E] += b1[0x0D]; b1[0x0D] += b1[0x0F];
            b1[0x10] = b2[0x10] + b2[0x11];   b1[0x11] = (b2[0x10] - b2[0x11]) * cos0;
            b1[0x12] = b2[0x12] + b2[0x13];   b1[0x13] = (b2[0x13] - b2[0x12]) * cos0;  b1[0x12] += b1[0x13];
            b1[0x14] = b2[0x14] + b2[0x15];   b1[0x15] = (b2[0x14] - b2[0x15]) * cos0;
            b1[0x16] = b2[0x16] + b2[0x17];   b1[0x17] = (b2[0x17] - b2[0x16]) * cos0;
            b1[0x16] += b1[0x17];    b1[0x14] += b1[0x16]; b1[0x16] += b1[0x15];  b1[0x15] += b1[0x17];
            b1[0x18] = b2[0x18] + b2[0x19];   b1[0x19] = (b2[0x18] - b2[0x19]) * cos0;
            b1[0x1A] = b2[0x1A] + b2[0x1B];   b1[0x1B] = (b2[0x1B] - b2[0x1A]) * cos0;  b1[0x1A] += b1[0x1B];
            b1[0x1C] = b2[0x1C] + b2[0x1D];   b1[0x1D] = (b2[0x1C] - b2[0x1D]) * cos0;
            b1[0x1E] = b2[0x1E] + b2[0x1F];   b1[0x1F] = (b2[0x1F] - b2[0x1E]) * cos0;
            b1[0x1E] += b1[0x1F];    b1[0x1C] += b1[0x1E]; b1[0x1E] += b1[0x1D];  b1[0x1D] += b1[0x1F];
        }

        out0[0x10 * 16] = b1[0x00];  out0[0x10 * 12] = b1[0x04]; out0[0x10 * 8]  = b1[0x02];  out0[0x10 * 4]  = b1[0x06];
        out0[0] = b1[0x01];  out1[0]  = b1[0x01]; out1[0x10 * 4]  = b1[0x05];  out1[0x10 * 8]  = b1[0x03];
        out1[0x10 * 12] = b1[0x07];

        b1[0x08] += b1[0x0C];  out0[0x10 * 14] = b1[0x08];  b1[0x0C] += b1[0x0a];  out0[0x10 * 10] = b1[0x0C];
        b1[0x0A] += b1[0x0E];  out0[0x10 * 6]  = b1[0x0A];  b1[0x0E] += b1[0x09];  out0[0x10 * 2]  = b1[0x0E];
        b1[0x09] += b1[0x0D];  out1[0x10 * 2]  = b1[0x09];  b1[0x0D] += b1[0x0B];  out1[0x10 * 6]  = b1[0x0D];
        b1[0x0B] += b1[0x0F];  out1[0x10 * 10] = b1[0x0B];  out1[0x10 * 14] = b1[0x0F];

        b1[0x18] += b1[0x1C];  out0[0x10 * 15] = b1[0x10] + b1[0x18];   out0[0x10 * 13] = b1[0x18] + b1[0x14];
        b1[0x1C] += b1[0x1a];  out0[0x10 * 11] = b1[0x14] + b1[0x1C];   out0[0x10 * 9]  = b1[0x1C] + b1[0x12];
        b1[0x1A] += b1[0x1E];  out0[0x10 * 7]  = b1[0x12] + b1[0x1A];   out0[0x10 * 5]  = b1[0x1A] + b1[0x16];
        b1[0x1E] += b1[0x19];  out0[0x10 * 3]  = b1[0x16] + b1[0x1E];   out0[0x10 * 1]  = b1[0x1E] + b1[0x11];
        b1[0x19] += b1[0x1D];  out1[0x10 * 1]  = b1[0x11] + b1[0x19];   out1[0x10 * 3]  = b1[0x19] + b1[0x15];
        b1[0x1D] += b1[0x1B];  out1[0x10 * 5]  = b1[0x15] + b1[0x1D];   out1[0x10 * 7]  = b1[0x1D] + b1[0x13];
        b1[0x1B] += b1[0x1F];  out1[0x10 * 9]  = b1[0x13] + b1[0x1B];   out1[0x10 * 11] = b1[0x1B] + b1[0x17];
        out1[0x10 * 13] = b1[0x17] + b1[0x1F];  out1[0x10 * 15] = b1[0x1F];
    }
}

//==============================================================================
struct MP3Stream
{
    MP3Stream (InputStream& source)  : stream (source, 8192)
    {
        reset();
    }

    int decodeNextBlock (float* out0, float* out1, int& done)
    {
        if (! headerParsed)
        {
            auto nextFrameOffset = scanForNextFrameHeader (false);

            if (lastFrameSize == -1 || needToSyncBitStream)
            {
                needToSyncBitStream = false;
                readVBRHeader();

                if (vbrHeaderFound)
                    return 1;
            }

            if (nextFrameOffset < 0)
                return -1;

            if (nextFrameOffset > 0)
            {
                wasFreeFormat = false;
                needToSyncBitStream = true;
                auto size = (int) (bufferPointer - (bufferSpace[bufferSpaceIndex] + 512));

                if (size > 2880)
                {
                    size = 0;
                    bufferPointer = bufferSpace[bufferSpaceIndex] + 512;
                }

                auto toSkip = (size + nextFrameOffset) - 2880;

                if (toSkip > 0)
                {
                    stream.skipNextBytes (toSkip);
                    nextFrameOffset -= toSkip;
                }

                stream.read (bufferPointer, nextFrameOffset);
                lastFrameSize += nextFrameOffset;
            }

            const auto successful = frame.decodeHeader ((uint32) stream.readIntBigEndian());

            if (successful == MP3Frame::ParseSuccessful::no)
                return -1;

            headerParsed = true;
            frameSize = frame.frameSize;
            isFreeFormat = (frameSize == 0);
            sideInfoSize = frame.lsf != 0 ? ((frame.numChannels == 1) ? 9 : 17)
                                          : ((frame.numChannels == 1) ? 17 : 32);

            if (frame.crc16FollowsHeader)
                sideInfoSize += 2;

            bufferSpaceIndex = 1 - bufferSpaceIndex;
            bufferPointer = bufferSpace[bufferSpaceIndex] + 512;
            bitIndex = 0;

            if (lastFrameSize < 0)
                return 1;
        }

        if (! sideParsed)
        {
            if (frame.layer == 3)
            {
                stream.read (bufferPointer, sideInfoSize);

                if (frame.crc16FollowsHeader)
                    getBits (16);

                auto bits = jmax (0, decodeLayer3SideInfo());
                dataSize = (bits + 7) / 8;

                if (! isFreeFormat)
                    dataSize = jmin (dataSize, frame.frameSize - sideInfoSize);
            }
            else
            {
                dataSize = frame.frameSize;
                sideInfoSize = 0;
            }

            sideParsed = true;
        }

        int result = 1;

        if (! dataParsed)
        {
            stream.read (bufferPointer, dataSize);

            if (out0 != nullptr)
            {
                if (frame.layer < 3 && frame.crc16FollowsHeader)
                    getBits (16);

                switch (frame.layer)
                {
                    case 1:  decodeLayer1Frame (out0, out1, done); break;
                    case 2:  decodeLayer2Frame (out0, out1, done); break;
                    case 3:  decodeLayer3Frame (out0, out1, done); break;
                    default: break;
                }
            }

            bufferPointer = bufferSpace[bufferSpaceIndex] + 512 + sideInfoSize + dataSize;
            dataParsed = true;
            result = 0;
        }

        if (isFreeFormat)
        {
            if (wasFreeFormat)
            {
                frameSize = lastFrameSizeNoPadding + frame.padding;
            }
            else
            {
                auto nextFrameOffset = scanForNextFrameHeader (true);

                wasFreeFormat = isFreeFormat;

                if (nextFrameOffset < 0)
                {
                    lastFrameSize = frameSize;
                    return result;
                }

                frameSize = nextFrameOffset + sideInfoSize + dataSize;
                lastFrameSizeNoPadding = frameSize - frame.padding;
            }
        }

        if (result == 0)
            return result;

        int bytes = frameSize - (sideInfoSize + dataSize);

        if (bytes > 0)
        {
            auto toSkip = bytes - 512;

            if (toSkip > 0)
            {
                stream.skipNextBytes (toSkip);
                bytes -= toSkip;
                frameSize -= toSkip;
            }

            stream.read (bufferPointer, bytes);
            bufferPointer += bytes;
        }

        lastFrameSize = frameSize;
        wasFreeFormat = isFreeFormat;
        frameSize = 0;
        headerParsed = sideParsed = dataParsed = false;
        return result;
    }

    bool seek (int frameIndex)
    {
        frameIndex = jmax (0, frameIndex);

        while (frameIndex >= frameStreamPositions.size() * storedStartPosInterval)
        {
            int dummy = 0;
            auto result = decodeNextBlock (nullptr, nullptr, dummy);

            if (result < 0)
                return false;

            if (result > 0)
                break;
        }

        frameIndex = jmin (frameIndex & ~(storedStartPosInterval - 1),
                           (frameStreamPositions.size() - 1) * storedStartPosInterval);

        stream.setPosition (frameStreamPositions.getUnchecked (frameIndex / storedStartPosInterval));
        currentFrameIndex = frameIndex;
        reset();
        return true;
    }

    MP3Frame frame;
    VBRTagData vbrTagData;
    BufferedInputStream stream;
    int numFrames = 0, currentFrameIndex = 0;
    bool vbrHeaderFound = false;

private:
    bool headerParsed, sideParsed, dataParsed, needToSyncBitStream;
    bool isFreeFormat, wasFreeFormat;
    int sideInfoSize, dataSize;
    int frameSize, lastFrameSize, lastFrameSizeNoPadding;
    int bufferSpaceIndex;
    Layer3SideInfo sideinfo;
    uint8 bufferSpace[2][2880 + 1024];
    uint8* bufferPointer;
    int bitIndex, synthBo;
    float hybridBlock[2][2][32 * 18];
    int hybridBlockIndex[2];
    float synthBuffers[2][2][0x110];
    float hybridIn[2][32][18];
    float hybridOut[2][18][32];

    void reset() noexcept
    {
        headerParsed = sideParsed = dataParsed = isFreeFormat = wasFreeFormat = false;
        lastFrameSize = -1;
        needToSyncBitStream = true;
        frameSize = sideInfoSize = dataSize = bitIndex = 0;
        lastFrameSizeNoPadding = bufferSpaceIndex = 0;
        bufferPointer = bufferSpace[bufferSpaceIndex] + 512;
        synthBo = 1;

        zerostruct (sideinfo);
        zeromem (bufferSpace, sizeof (bufferSpace));
        zeromem (hybridBlock, sizeof (hybridBlock));
        zeromem (hybridBlockIndex, sizeof (hybridBlockIndex));
        zeromem (synthBuffers, sizeof (synthBuffers));
    }

    enum { storedStartPosInterval = 4 };
    Array<int64> frameStreamPositions;

    struct SideInfoLayer1
    {
        uint8 allocation[32][2];
        uint8 scaleFactor[32][2];
    };

    struct SideInfoLayer2
    {
        uint8 allocation[32][2];
        uint8 scaleFactor[32][2][3];
    };

    static bool isValidHeader (uint32 header, int oldLayer) noexcept
    {
        auto newLayer = (int) (4 - ((header >> 17) & 3));

        return (header & 0xffe00000) == 0xffe00000
                && newLayer != 4
                && (oldLayer <= 0 || newLayer == oldLayer)
                && ((header >> 12) & 15) != 15
                && ((header >> 10) & 3) != 3
                && (header & 3) != 2;
    }

    bool rollBackBufferPointer (int backstep) noexcept
    {
        if (lastFrameSize < 0 && backstep > 0)
            return false;

        auto* oldBuffer = bufferSpace[1 - bufferSpaceIndex] + 512;
        bufferPointer -= backstep;

        if (backstep != 0)
            memcpy (bufferPointer, oldBuffer + lastFrameSize - backstep, (size_t) backstep);

        bitIndex = 0;
        return true;
    }

    uint32 getBits (int numBits) noexcept
    {
        if (numBits <= 0 || bufferPointer == nullptr)
            return 0;

        const auto result = (uint32) (((((((bufferPointer[0] << 8) | bufferPointer[1]) << 8)
                                       | bufferPointer[2]) << bitIndex) & 0xffffff) >> (24 - numBits));
        bitIndex += numBits;
        bufferPointer += (bitIndex >> 3);
        bitIndex &= 7;
        return result;
    }

    uint32 getOneBit() noexcept
    {
        auto result = (uint8) (*bufferPointer << bitIndex);
        ++bitIndex;
        bufferPointer += (bitIndex >> 3);
        bitIndex &= 7;
        return (uint32) (result >> 7);
    }

    uint32 getBitsUnchecked (int numBits) noexcept
    {
        const auto result = (uint32) (((((bufferPointer[0] << 8) | bufferPointer[1]) << bitIndex) & 0xffff) >> (16 - numBits));
        bitIndex += numBits;
        bufferPointer += (bitIndex >> 3);
        bitIndex &= 7;
        return result;
    }

    inline uint8  getBitsUint8  (int numBits) noexcept  { return (uint8)  getBitsUnchecked (numBits); }
    inline uint16 getBitsUint16 (int numBits) noexcept  { return (uint16) getBitsUnchecked (numBits); }

    int scanForNextFrameHeader (bool checkTypeAgainstLastFrame) noexcept
    {
        auto oldPos = stream.getPosition();
        int offset = -3;
        uint32 header = 0;

        for (;;)
        {
            if (stream.isExhausted() || stream.getPosition() > oldPos + 32768)
            {
                offset = -1;
                break;
            }

            header = (header << 8) | (uint8) stream.readByte();

            if (offset >= 0 && isValidHeader (header, frame.layer))
            {
                if (! checkTypeAgainstLastFrame)
                    break;

                const bool mpeg25            = (header & (1 << 20)) == 0;
                const uint32 lsf             = mpeg25 ? 1 : ((header & (1 << 19)) ? 0 : 1);
                const uint32 sampleRateIndex = mpeg25 ? (6 + ((header >> 10) & 3)) : (((header >> 10) & 3) + (lsf * 3));
                const uint32 mode            = (header >> 6) & 3;
                const uint32 numChannels     = (mode == 3) ? 1 : 2;

                if (numChannels == (uint32) frame.numChannels && lsf == (uint32) frame.lsf
                      && mpeg25 == frame.mpeg25 && sampleRateIndex == (uint32) frame.sampleRateIndex)
                    break;
            }

            ++offset;
        }

        if (offset >= 0)
        {
            if ((currentFrameIndex & (storedStartPosInterval - 1)) == 0)
                frameStreamPositions.set (currentFrameIndex / storedStartPosInterval, oldPos + offset);

            ++currentFrameIndex;
        }

        stream.setPosition (oldPos);
        return offset;
    }

    void readVBRHeader()
    {
        auto oldPos = stream.getPosition();
        uint8 xing[194];
        stream.read (xing, sizeof (xing));

        vbrHeaderFound = vbrTagData.read (xing);

        if (vbrHeaderFound)
        {
            numFrames = (int) vbrTagData.frames;
            oldPos += jmax (vbrTagData.headersize, 1);
        }

        stream.setPosition (oldPos);
    }

    void decodeLayer1Frame (float* pcm0, float* pcm1, int& samplesDone) noexcept
    {
        float fraction[2][32];
        SideInfoLayer1 si;
        layer1Step1 (si);
        auto single = (frame.numChannels == 1 || frame.single == 3) ? 0 : frame.single;

        if (single >= 0)
        {
            for (int i = 0; i < 12; ++i)
            {
                layer1Step2 (si, fraction);
                synthesise (fraction[single], 0, pcm0, samplesDone);
            }
        }
        else
        {
            for (int i = 0; i < 12; ++i)
            {
                layer1Step2 (si, fraction);
                synthesiseStereo (fraction[0], fraction[1], pcm0, pcm1, samplesDone);
            }
        }
    }

    void decodeLayer2Frame (float* pcm0, float* pcm1, int& samplesDone)
    {
        float fraction[2][4][32];
        frame.selectLayer2Table();
        SideInfoLayer2 si;
        layer2Step1 (si);
        auto single = (frame.numChannels == 1 || frame.single == 3) ? 0 : frame.single;

        if (single >= 0)
        {
            for (int i = 0; i < 12; ++i)
            {
                layer2Step2 (si, i >> 2, fraction);

                for (int j = 0; j < 3; ++j)
                    synthesise (fraction[single][j], 0, pcm0, samplesDone);
            }
        }
        else
        {
            for (int i = 0; i < 12; ++i)
            {
                layer2Step2 (si, i >> 2, fraction);

                for (int j = 0; j < 3; ++j)
                    synthesiseStereo (fraction[0][j], fraction[1][j], pcm0, pcm1, samplesDone);
            }
        }
    }

    void decodeLayer3Frame (float* pcm0, float* pcm1, int& samplesDone) noexcept
    {
        if (! rollBackBufferPointer ((int) sideinfo.mainDataStart))
            return;

        const int single = frame.numChannels == 1 ? 0 : frame.single;
        const int numChans = (frame.numChannels == 1 || single >= 0) ? 1 : 2;
        const bool msStereo = (frame.mode == 1) && (frame.modeExt & 2) != 0;
        const bool iStereo  = (frame.mode == 1) && (frame.modeExt & 1) != 0;
        const int granules = frame.lsf ? 1 : 2;
        int scaleFactors[2][39];

        for (int gr = 0; gr < granules; ++gr)
        {
            {
                auto& granule = sideinfo.ch[0].gr[gr];
                auto part2bits = frame.lsf ? getLayer3ScaleFactors2 (scaleFactors[0], granule, 0)
                                           : getLayer3ScaleFactors1 (scaleFactors[0], granule);

                if (layer3DequantizeSample (hybridIn[0], scaleFactors[0], granule, frame.sampleRateIndex, part2bits))
                    return;
            }

            if (frame.numChannels == 2)
            {
                auto& granule = sideinfo.ch[1].gr[gr];
                auto part2bits = frame.lsf ? getLayer3ScaleFactors2 (scaleFactors[1], granule, iStereo)
                                           : getLayer3ScaleFactors1 (scaleFactors[1], granule);

                if (layer3DequantizeSample (hybridIn[1], scaleFactors[1], granule, frame.sampleRateIndex, part2bits))
                    return;

                if (msStereo)
                {
                    for (int i = 0; i < 32 * 18; ++i)
                    {
                        auto tmp0 = ((const float*) hybridIn[0])[i];
                        auto tmp1 = ((const float*) hybridIn[1])[i];
                        ((float*) hybridIn[1])[i] = tmp0 - tmp1;
                        ((float*) hybridIn[0])[i] = tmp0 + tmp1;
                    }
                }

                if (iStereo)
                    granule.doIStereo (hybridIn, scaleFactors[1], frame.sampleRateIndex, msStereo, frame.lsf);

                if (msStereo || iStereo || single == 3)
                {
                    if (granule.maxb > sideinfo.ch[0].gr[gr].maxb)
                        sideinfo.ch[0].gr[gr].maxb = granule.maxb;
                    else
                        granule.maxb = sideinfo.ch[0].gr[gr].maxb;
                }

                switch (single)
                {
                    case 3:
                    {
                        auto* in0 = (float*) hybridIn[0];
                        auto* in1 = (const float*) hybridIn[1];

                        for (int i = 0; i < (int) (18 * granule.maxb); ++i, ++in0)
                            *in0 = (*in0 + *in1++);
                    }
                    break;

                    case 1:
                    {
                        auto* in0 = (float*) hybridIn[0];
                        auto* in1 = (const float*) hybridIn[1];

                        for (int i = 0; i < (int) (18 * granule.maxb); ++i)
                            *in0++ = *in1++;
                    }
                    break;

                    default:
                        break;
                }
            }

            for (int ch = 0; ch < numChans; ++ch)
            {
                auto& granule = sideinfo.ch[ch].gr[gr];
                granule.doAntialias (hybridIn[ch]);
                layer3Hybrid (hybridIn[ch], hybridOut[ch], ch, granule);
            }

            for (int ss = 0; ss < 18; ++ss)
            {
                if (single >= 0)
                    synthesise (hybridOut[0][ss], 0, pcm0, samplesDone);
                else
                    synthesiseStereo (hybridOut[0][ss], hybridOut[1][ss], pcm0, pcm1, samplesDone);
            }
        }
    }

    int decodeLayer3SideInfo() noexcept
    {
        const int numChannels = frame.numChannels;
        const int sampleRate = frame.sampleRateIndex;
        const int single = (numChannels == 1) ? 0 : frame.single;
        const bool msStereo = (frame.mode == 1) && (frame.modeExt & 2) != 0;
        const int granules = frame.lsf ? 1 : 2;

        if (frame.lsf == 0)
            getLayer3SideInfo1 (numChannels, msStereo, sampleRate, single);
        else
            getLayer3SideInfo2 (numChannels, msStereo, sampleRate, single);

        int databits = 0;

        for (int gr = 0; gr < granules; ++gr)
            for (int ch = 0; ch < numChannels; ++ch)
                databits += (int) sideinfo.ch[ch].gr[gr].part2_3Length;

        return databits - 8 * (int) sideinfo.mainDataStart;
    }

    void layer1Step1 (SideInfoLayer1& si) noexcept
    {
        zerostruct (si);
        int i, jsbound = (frame.mode == 1) ? (frame.modeExt << 2) + 4 : 32;

        if (frame.numChannels == 2)
        {
            for (i = 0; i < jsbound; ++i)
            {
                si.allocation[i][0] = getBitsUint8 (4);
                si.allocation[i][1] = getBitsUint8 (4);
            }

            for (i = jsbound; i < 32; ++i)
                si.allocation[i][0] = si.allocation[i][1] = getBitsUint8 (4);

            for (i = 0; i < 32; ++i)
            {
                si.scaleFactor[i][0] = si.allocation[i][0] ? getBitsUint8 (6) : 0;
                si.scaleFactor[i][1] = si.allocation[i][1] ? getBitsUint8 (6) : 0;
            }
        }
        else
        {
            for (i = 0; i < 32; ++i)
                si.allocation[i][0] = getBitsUint8 (4);

            for (i = 0; i < 32; ++i)
                si.scaleFactor[i][0] = si.allocation[i][0] ? getBitsUint8 (6) : 0;
        }
    }

    void layer1Step2 (SideInfoLayer1& si, float fraction[2][32]) noexcept
    {
        if (frame.numChannels == 2)
        {
            int i, jsbound = (frame.mode == 1) ? (frame.modeExt << 2) + 4 : 32;

            for (i = 0; i < jsbound; ++i)
            {
                const uint8 n0 = si.allocation[i][0];
                const uint8 n1 = si.allocation[i][1];
                fraction[0][i] = n0 > 0 ? ((float) (-(1 << n0) + getBitsUint16 (n0 + 1) + 1) * constants.muls[n0 + 1][si.scaleFactor[i][0]]) : 0.0f;
                fraction[1][i] = n1 > 0 ? ((float) (-(1 << n1) + getBitsUint16 (n1 + 1) + 1) * constants.muls[n1 + 1][si.scaleFactor[i][1]]) : 0.0f;
            }

            for (i = jsbound; i < 32; ++i)
            {
                const uint8 n = si.allocation[i][0];

                if (n > 0)
                {
                    const uint32 w = ((uint32) -(1 << n) + getBitsUint16 (n + 1) + 1);
                    fraction[0][i] = ((float) w * constants.muls[n + 1][si.scaleFactor[i][0]]);
                    fraction[1][i] = ((float) w * constants.muls[n + 1][si.scaleFactor[i][1]]);
                }
                else
                    fraction[0][i] = fraction[1][i] = 0;
            }
        }
        else
        {
            for (int i = 0; i < 32; ++i)
            {
                const uint8 n = si.allocation[i][0];
                const uint8 j = si.scaleFactor[i][0];

                if (n > 0)
                    fraction[0][i] = ((float) (-(1 << n) + getBitsUint16 (n + 1) + 1) * constants.muls[n + 1][j]);
                else
                    fraction[0][i] = 0;
            }
        }
    }

    void layer2Step1 (SideInfoLayer2& si) noexcept
    {
        zerostruct (si);
        const auto sblimit = frame.layer2SubBandLimit;
        const auto jsbound = (frame.mode == 1 ? jmin ((frame.modeExt << 2) + 4, sblimit) : sblimit);
        auto* allocTable = frame.allocationTable;
        uint8 scfsi[32][2];

        if (frame.numChannels == 2)
        {
            for (int i = 0; i < jsbound; ++i)
            {
                auto step = allocTable->bits;
                allocTable += (static_cast<intptr_t> (1) << step);
                si.allocation[i][0] = getBitsUint8 (step);
                si.allocation[i][1] = getBitsUint8 (step);
            }

            for (int i = jsbound; i < sblimit; ++i)
            {
                auto step = allocTable->bits;
                auto b0 = getBitsUint8 (step);
                allocTable += (static_cast<intptr_t> (1) << step);
                si.allocation[i][0] = b0;
                si.allocation[i][1] = b0;
            }

            for (int i = 0; i < sblimit; ++i)
            {
                scfsi[i][0] = si.allocation[i][0] ? getBitsUint8 (2) : 0;
                scfsi[i][1] = si.allocation[i][1] ? getBitsUint8 (2) : 0;
            }
        }
        else
        {
            for (int i = 0; i < sblimit; ++i)
            {
                const int16 step = allocTable->bits;
                allocTable += (static_cast<intptr_t> (1) << step);
                si.allocation[i][0] = getBitsUint8 (step);
            }

            for (int i = 0; i < sblimit; ++i)
                scfsi[i][0] = si.allocation[i][0] ? getBitsUint8 (2) : 0;
        }

        for (int i = 0; i < sblimit; ++i)
        {
            for (int ch = 0; ch < frame.numChannels; ++ch)
            {
                uint8 s0 = 0, s1 = 0, s2 = 0;

                if (si.allocation[i][ch])
                {
                    switch (scfsi[i][ch])
                    {
                        case 0:
                            s0 = getBitsUint8 (6);
                            s1 = getBitsUint8 (6);
                            s2 = getBitsUint8 (6);
                            break;
                        case 1:
                            s1 = s0 = getBitsUint8 (6);
                            s2 = getBitsUint8 (6);
                            break;
                        case 2:
                            s2 = s1 = s0 = getBitsUint8 (6);
                            break;
                        case 3:
                            s0 = getBitsUint8 (6);
                            s2 = s1 = getBitsUint8 (6);
                            break;
                        default:
                            break;
                    }
                }

                si.scaleFactor[i][ch][0] = s0;
                si.scaleFactor[i][ch][1] = s1;
                si.scaleFactor[i][ch][2] = s2;
            }
        }
    }

    void layer2Step2 (SideInfoLayer2& si, const int gr, float fraction[2][4][32]) noexcept
    {
        auto* allocTable = frame.allocationTable;
        auto sblimit = frame.layer2SubBandLimit;
        const auto jsbound = (frame.mode == 1 ? jmin ((frame.modeExt << 2) + 4, sblimit) : sblimit);

        for (int i = 0; i < jsbound; ++i)
        {
            auto step = allocTable->bits;

            for (int ch = 0; ch < frame.numChannels; ++ch)
            {
                if (auto ba = si.allocation[i][ch])
                {
                    auto x1 = jmin ((uint8) 63, si.scaleFactor[i][ch][gr]);
                    auto* alloc2 = allocTable + ba;
                    auto k = jmin ((int16) 16, alloc2->bits);
                    auto d1 = alloc2->d;

                    if (d1 < 0)
                    {
                        const double cm = constants.muls[k][x1];
                        fraction[ch][0][i] = (float) (((int) getBits (k) + d1) * cm);
                        fraction[ch][1][i] = (float) (((int) getBits (k) + d1) * cm);
                        fraction[ch][2][i] = (float) (((int) getBits (k) + d1) * cm);
                    }
                    else
                    {
                        auto* tab = constants.getGroupTable (d1, getBits (k));
                        fraction[ch][0][i] = (float) constants.muls[tab[0]][x1];
                        fraction[ch][1][i] = (float) constants.muls[tab[1]][x1];
                        fraction[ch][2][i] = (float) constants.muls[tab[2]][x1];
                    }
                }
                else
                {
                    fraction[ch][0][i] = fraction[ch][1][i] = fraction[ch][2][i] = 0;
                }
            }

            allocTable += (static_cast<intptr_t> (1) << step);
        }

        for (int i = jsbound; i < frame.layer2SubBandLimit; ++i)
        {
            auto step = allocTable->bits;
            auto ba = si.allocation[i][0];

            if (ba != 0)
            {
                auto* alloc2 = allocTable + ba;
                int16 k = alloc2->bits;
                int16 d1 = alloc2->d;
                k = (k <= 16) ? k : 16;

                if (d1 < 0)
                {
                    auto v0 = (int) getBits (k);
                    auto v1 = (int) getBits (k);
                    auto v2 = (int) getBits (k);

                    for (int ch = 0; ch < frame.numChannels; ++ch)
                    {
                        auto x1 = jmin ((uint8) 63, si.scaleFactor[i][ch][gr]);
                        const double cm = constants.muls[k][x1];
                        fraction[ch][0][i] = (float) ((v0 + d1) * cm);
                        fraction[ch][1][i] = (float) ((v1 + d1) * cm);
                        fraction[ch][2][i] = (float) ((v2 + d1) * cm);
                    }
                }
                else
                {
                    auto* tab = constants.getGroupTable (d1, getBits (k));
                    auto k0 = tab[0];
                    auto k1 = tab[1];
                    auto k2 = tab[2];

                    for (int ch = 0; ch < frame.numChannels; ++ch)
                    {
                        auto x1 = jmin ((uint8) 63, si.scaleFactor[i][ch][gr]);
                        fraction[ch][0][i] = (float) constants.muls[k0][x1];
                        fraction[ch][1][i] = (float) constants.muls[k1][x1];
                        fraction[ch][2][i] = (float) constants.muls[k2][x1];
                    }
                }
            }
            else
            {
                fraction[0][0][i] = fraction[0][1][i] = fraction[0][2][i] = 0;
                fraction[1][0][i] = fraction[1][1][i] = fraction[1][2][i] = 0;
            }

            allocTable += (static_cast<intptr_t> (1) << step);
        }

        for (int ch = 0; ch < frame.numChannels; ++ch)
            for (int i = frame.layer2SubBandLimit; i < 32; ++i)
                fraction[ch][0][i] = fraction[ch][1][i] = fraction[ch][2][i] = 0;
    }

    void getLayer3SideInfo1 (const int stereo, const bool msStereo, const int sampleRate, const int single) noexcept
    {
        const int powdiff = (single == 3) ? 4 : 0;
        sideinfo.mainDataStart = getBits (9);
        sideinfo.privateBits = getBitsUnchecked (stereo == 1 ? 5 : 3);

        for (int ch = 0; ch < stereo; ++ch)
        {
            sideinfo.ch[ch].gr[0].scfsi = -1;
            sideinfo.ch[ch].gr[1].scfsi = (int) getBitsUnchecked (4);
        }

        for (int gr = 0; gr < 2; ++gr)
        {
            for (int ch = 0; ch < stereo; ++ch)
            {
                auto& granule = sideinfo.ch[ch].gr[gr];

                granule.part2_3Length = getBits (12);
                granule.bigValues = jmin (288u, getBitsUnchecked (9));

                const int qss = (int) getBitsUnchecked (8);
                granule.pow2gain = constants.powToGains + 256 - qss + powdiff;

                if (msStereo)
                    granule.pow2gain += 2;

                granule.scaleFactorCompression = getBitsUnchecked (4);

                if (getOneBit())
                {
                    granule.blockType = getBitsUnchecked (2);
                    granule.mixedBlockFlag = getOneBit();
                    granule.tableSelect[0] = getBitsUnchecked (5);
                    granule.tableSelect[1] = getBitsUnchecked (5);
                    granule.tableSelect[2] = 0;

                    for (int i = 0; i < 3; ++i)
                    {
                        const uint32 sbg = (getBitsUnchecked (3) << 3);
                        granule.fullGain[i] = granule.pow2gain + sbg;
                    }

                    granule.region1Start = 36 >> 1;
                    granule.region2Start = 576 >> 1;
                }
                else
                {
                    for (int i = 0; i < 3; ++i)
                        granule.tableSelect[i] = getBitsUnchecked (5);

                    const int r0c = (int) getBitsUnchecked (4);
                    const int r1c = (int) getBitsUnchecked (3);
                    const int region0index = jmin (22, r0c + 1);
                    const int region1index = jmin (22, r0c + 1 + r1c + 1);

                    granule.region1Start = (uint32) (bandInfo[sampleRate].longIndex[region0index] >> 1);
                    granule.region2Start = (uint32) (bandInfo[sampleRate].longIndex[region1index] >> 1);
                    granule.blockType = 0;
                    granule.mixedBlockFlag = 0;
                }

                granule.preflag = getOneBit();
                granule.scaleFactorScale = getOneBit();
                granule.count1TableSelect = getOneBit();
            }
        }
    }

    void getLayer3SideInfo2 (const int stereo, const bool msStereo, const int sampleRate, const int single) noexcept
    {
        const int powdiff = (single == 3) ? 4 : 0;
        sideinfo.mainDataStart = getBits (8);
        sideinfo.privateBits = stereo == 1 ? getOneBit() : getBitsUnchecked (2);

        for (int ch = 0; ch < stereo; ++ch)
        {
            auto& granule = sideinfo.ch[ch].gr[0];

            granule.part2_3Length = getBits (12);
            granule.bigValues = jmin (288u, getBitsUnchecked (9));

            const uint32 qss = getBitsUnchecked (8);
            granule.pow2gain = constants.powToGains + 256 - qss + powdiff;

            if (msStereo)
                granule.pow2gain += 2;

            granule.scaleFactorCompression = getBits (9);

            if (getOneBit())
            {
                granule.blockType = getBitsUnchecked (2);
                granule.mixedBlockFlag = getOneBit();
                granule.tableSelect[0] = getBitsUnchecked (5);
                granule.tableSelect[1] = getBitsUnchecked (5);
                granule.tableSelect[2] = 0;

                for (int i = 0; i < 3; ++i)
                {
                    const uint32 sbg = (getBitsUnchecked (3) << 3);
                    granule.fullGain[i] = granule.pow2gain + sbg;
                }

                if (granule.blockType == 0)
                {}

                if (granule.blockType == 2)
                    granule.region1Start = sampleRate == 8 ? 36 : (36 >> 1);
                else
                    granule.region1Start = sampleRate == 8 ? (108 >> 1) : (54 >> 1);

                granule.region2Start = 576 >> 1;
            }
            else
            {
                for (int i = 0; i < 3; ++i)
                    granule.tableSelect[i] = getBitsUnchecked (5);

                const int r0c = (int) getBitsUnchecked (4);
                const int r1c = (int) getBitsUnchecked (3);
                const int region0index = jmin (22, r0c + 1);
                const int region1index = jmin (22, r0c + 1 + r1c + 1);

                granule.region1Start = (uint32) (bandInfo[sampleRate].longIndex[region0index] >> 1);
                granule.region2Start = (uint32) (bandInfo[sampleRate].longIndex[region1index] >> 1);
                granule.blockType = 0;
                granule.mixedBlockFlag = 0;
            }
            granule.scaleFactorScale = getOneBit();
            granule.count1TableSelect = getOneBit();
        }
    }

    int getLayer3ScaleFactors1 (int* scf, const Layer3SideInfo::Info& granule) noexcept
    {
        static const uint8 lengths[2][16] =
        {
            { 0, 0, 0, 0, 3, 1, 1, 1, 2, 2, 2, 3, 3, 3, 4, 4 },
            { 0, 1, 2, 3, 0, 1, 2, 3, 1, 2, 3, 1, 2, 3, 2, 3 }
        };

        int numBits;
        const int num0 = lengths[0][granule.scaleFactorCompression];
        const int num1 = lengths[1][granule.scaleFactorCompression];

        if (granule.blockType == 2)
        {
            int i = 18;
            numBits = (num0 + num1) * 18;

            if (granule.mixedBlockFlag)
            {
                for (int j = 8; --j >= 0;)  *scf++ = (int) getBitsUnchecked (num0);
                numBits -= num0;
                i = 9;
            }

            for (; --i >= 0;)       *scf++ = (int) getBitsUnchecked (num0);
            for (i = 18; --i >= 0;) *scf++ = (int) getBitsUnchecked (num1);

            *scf++ = 0;
            *scf++ = 0;
            *scf++ = 0;
        }
        else
        {
            const int scfsi = granule.scfsi;

            if (scfsi < 0)
            {
                for (int i = 11; --i >= 0;)   *scf++ = (int) getBitsUnchecked (num0);
                for (int j = 10; --j >= 0;)   *scf++ = (int) getBitsUnchecked (num1);
                numBits = (num0 + num1) * 10 + num0;
            }
            else
            {
                numBits = 0;
                if ((scfsi & 8) == 0)
                {
                    for (int i = 6; --i >= 0;)  *scf++ = (int) getBitsUnchecked (num0);
                    numBits += num0 * 6;
                }
                else
                    scf += 6;

                if ((scfsi & 4) == 0)
                {
                    for (int i = 5; --i >= 0;)  *scf++ = (int) getBitsUnchecked (num0);
                    numBits += num0 * 5;
                }
                else
                    scf += 5;

                if ((scfsi & 2) == 0)
                {
                    for (int i = 5; --i >= 0;)  *scf++ = (int) getBitsUnchecked (num1);
                    numBits += num1 * 5;
                }
                else
                    scf += 5;

                if ((scfsi & 1) == 0)
                {
                    for (int i = 5; --i >= 0;)  *scf++ = (int) getBitsUnchecked (num1);
                    numBits += num1 * 5;
                }
                else
                    scf += 5;
            }

            *scf = 0;
        }

        return numBits;
    }

    JUCE_BEGIN_IGNORE_WARNINGS_MSVC (6385)
    int getLayer3ScaleFactors2 (int* scf, Layer3SideInfo::Info& granule, const bool iStereo) noexcept
    {
        static const uint8 scaleTable[3][6][4] =
        {
            { { 6, 5, 5, 5 }, { 6, 5, 7, 3 },  { 11, 10, 0, 0 }, { 7, 7, 7, 0 },    { 6, 6, 6, 3 },  { 8, 8, 5, 0 } },
            { { 9, 9, 9, 9 }, { 9, 9, 12, 6 }, { 18, 18, 0, 0 }, { 12, 12, 12, 0 }, { 12, 9, 9, 6 }, { 15, 12, 9, 0 } },
            { { 6, 9, 9, 9 }, { 6, 9, 12, 6 }, { 15, 18, 0, 0 }, { 6, 15, 12, 0 },  { 6, 12, 9, 6 }, { 6, 18, 9, 0 } }
        };

        uint32 len = iStereo ? constants.iLength2[granule.scaleFactorCompression >> 1]
                             : constants.nLength2[granule.scaleFactorCompression];

        granule.preflag = (len >> 15) & 1;

        int n = 0;
        if (granule.blockType == 2)
        {
            ++n;
            if (granule.mixedBlockFlag)
                ++n;
        }

        const uint8* const data = scaleTable[n][(len >> 12) & 7];
        int numBits = 0;

        for (int i = 0; i < 4; ++i)
        {
            int num = len & 7;
            len >>= 3;

            if (num)
            {
                for (int j = 0; j < (int) (data[i]); ++j)
                    *scf++ = (int) getBitsUnchecked (num);

                numBits += data[i] * num;
            }
            else
            {
                for (int j = 0; j < (int) (data[i]); ++j)
                    *scf++ = 0;
            }
        }

        n = (n << 1) + 1;

        for (int i = 0; i < n; ++i)
            *scf++ = 0;

        return numBits;
    }
    JUCE_END_IGNORE_WARNINGS_MSVC

    bool layer3DequantizeSample (float xr[32][18], int* scf, Layer3SideInfo::Info& granule, int sampleRate, int part2bits) noexcept
    {
        const uint32 shift = 1 + granule.scaleFactorScale;
        auto* xrpnt = (float*) xr;
        auto part2remain = (int) granule.part2_3Length - part2bits;

        zeromem (xrpnt, (size_t) (&xr[32][0] - xrpnt) * sizeof (float));

        auto bv = (int) granule.bigValues;
        auto region1 = (int) granule.region1Start;
        auto region2 = (int) granule.region2Start;
        int l3 = ((576 >> 1) - bv) >> 1;
        int l[3];

        if (bv <= region1)
        {
            l[0] = bv;
            l[1] = 0;
            l[2] = 0;
        }
        else
        {
            l[0] = region1;
            if (bv <= region2)
            {
                l[1] = bv - l[0];
                l[2] = 0;
            }
            else
            {
                l[1] = region2 - l[0];
                l[2] = bv - region2;
            }
        }

        for (int i = 0; i < 3; ++i)
            if (l[i] < 0)
                l[i] = 0;

        if (granule.blockType == 2)
        {
            int max[4];
            int step = 0, lwin = 0, cb = 0, mc = 0;
            float v = 0;
            int* map;
            int* mapEnd;

            if (granule.mixedBlockFlag)
            {
                max[3] = -1;
                max[0] = max[1] = max[2] = 2;
                map    = constants.map   [sampleRate][0];
                mapEnd = constants.mapEnd[sampleRate][0];
            }
            else
            {
                max[0] = max[1] = max[2] = max[3] = -1;
                map    = constants.map   [sampleRate][1];
                mapEnd = constants.mapEnd[sampleRate][1];
            }

            for (int i = 0; i < 2; ++i)
            {
                auto* h = huffmanTables1 + granule.tableSelect[i];

                for (int lp = l[i]; lp != 0; --lp, --mc)
                {
                    int x, y;
                    if (mc == 0)
                    {
                        mc = *map++;
                        xrpnt = ((float*) xr) + (*map++);
                        lwin = *map++;
                        cb = *map++;

                        if (lwin == 3)
                        {
                            v = granule.pow2gain[ (*scf++) << shift];
                            step = 1;
                        }
                        else
                        {
                            v = granule.fullGain[lwin][ (*scf++) << shift];
                            step = 3;
                        }
                    }

                    auto* val = h->table;

                    while ((y = *val++) < 0)
                    {
                        if (getOneBit())
                            val -= y;

                        --part2remain;
                    }

                    x = y >> 4;
                    y &= 15;

                    if (x == 15)
                    {
                        max[lwin] = cb;
                        part2remain -= (int) (h->bits + 1);
                        x += (int) getBits ((int) h->bits);
                        *xrpnt = constants.nToThe4Over3[x] * (getOneBit() ? -v : v);
                    }
                    else if (x)
                    {
                        max[lwin] = cb;
                        *xrpnt = constants.nToThe4Over3[x] * (getOneBit() ? -v : v);
                        --part2remain;
                    }
                    else
                        *xrpnt = 0;

                    xrpnt += step;

                    if (y == 15)
                    {
                        max[lwin] = cb;
                        part2remain -= (int) (h->bits + 1);
                        y += (int) getBits ((int) h->bits);
                        *xrpnt = constants.nToThe4Over3[y] * (getOneBit() ? -v : v);
                    }
                    else if (y)
                    {
                        max[lwin] = cb;
                        *xrpnt = constants.nToThe4Over3[y] * (getOneBit() ? -v : v);
                        --part2remain;
                    }
                    else
                        *xrpnt = 0;

                    xrpnt += step;
                }
            }

            for (; l3 && (part2remain > 0); --l3)
            {
                auto* h = huffmanTables2 + granule.count1TableSelect;
                auto* val = h->table;
                int16 a;

                while ((a = *val++) < 0)
                {
                    if (part2remain <= 0)
                    {
                        a = 0;
                        break;
                    }

                    --part2remain;

                    if (getOneBit())
                        val -= a;
                }

                for (int i = 0; i < 4; ++i)
                {
                    if ((i & 1) == 0)
                    {
                        if (mc == 0)
                        {
                            mc = *map++;
                            xrpnt = ((float*) xr) + (*map++);
                            lwin = *map++;
                            cb = *map++;

                            if (lwin == 3)
                            {
                                v = granule.pow2gain[ (*scf++) << shift];
                                step = 1;
                            }
                            else
                            {
                                v = granule.fullGain[lwin][ (*scf++) << shift];
                                step = 3;
                            }
                        }

                        --mc;
                    }

                    if ((a & (8 >> i)))
                    {
                        max[lwin] = cb;

                        if (part2remain == 0)
                            break;

                        --part2remain;
                        *xrpnt = getOneBit() ? -v : v;
                    }
                    else
                        *xrpnt = 0;

                    xrpnt += step;
                }
            }

            while (map < mapEnd)
            {
                if (mc == 0)
                {
                    mc = *map++;
                    xrpnt = ((float*) xr) + *map++;
                    step = (*map++ == 3) ? 1 : 3;
                    ++map;
                }

                --mc;
                *xrpnt = 0;  xrpnt += step;
                *xrpnt = 0;  xrpnt += step;
            }

            granule.maxBand[0] = (uint32) (max[0] + 1);
            granule.maxBand[1] = (uint32) (max[1] + 1);
            granule.maxBand[2] = (uint32) (max[2] + 1);
            granule.maxBandl   = (uint32) (max[3] + 1);

            const int rmax = jmax (max[0], max[1], max[3]) + 1;
            granule.maxb = rmax ? (uint32) constants.shortLimit[sampleRate][rmax]
                                : (uint32) constants.longLimit[sampleRate][max[3] + 1];
        }
        else
        {
            static const int pretab1[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 3, 2, 0 };
            static const int pretab2[] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 };

            auto* pretab = (const int*) (granule.preflag ? pretab1 : pretab2);
            int max = -1, cb = 0, mc = 0;
            auto* map = constants.map[sampleRate][2];
            float v = 0;

            for (int i = 0; i < 3; ++i)
            {
                auto* h = huffmanTables1 + granule.tableSelect[i];

                for (int lp = l[i]; lp != 0; --lp, --mc)
                {
                    if (mc == 0)
                    {
                        mc = *map++;
                        v = granule.pow2gain[((*scf++) + (*pretab++)) << shift];
                        cb = *map++;
                    }

                    auto* val = h->table;
                    int y;

                    while ((y = *val++) < 0)
                    {
                        if (getOneBit()) val -= y;
                        --part2remain;
                    }

                    int x = y >> 4;
                    y &= 15;

                    if (x == 15)
                    {
                        max = cb;
                        part2remain -= (int) (h->bits + 1);
                        x += (int) getBits ((int) h->bits);
                        *xrpnt++ = constants.nToThe4Over3[x] * (getOneBit() ? -v : v);
                    }
                    else if (x)
                    {
                        max = cb;
                        *xrpnt++ = constants.nToThe4Over3[x] * (getOneBit() ? -v : v);
                        --part2remain;
                    }
                    else
                        *xrpnt++ = 0;

                    if (y == 15)
                    {
                        max = cb;
                        part2remain -= (int) (h->bits + 1);
                        y += (int) getBits ((int) h->bits);
                        *xrpnt++ = constants.nToThe4Over3[y] * (getOneBit() ? -v : v);
                    }
                    else if (y)
                    {
                        max = cb;
                        *xrpnt++ = constants.nToThe4Over3[y] * (getOneBit() ? -v : v);
                        --part2remain;
                    }
                    else
                        *xrpnt++ = 0;
                }
            }

            for (; l3 && part2remain > 0; --l3)
            {
                auto* h = huffmanTables2 + granule.count1TableSelect;
                auto* values = h->table;
                int16 a;

                while ((a = *values++) < 0)
                {
                    if (part2remain <= 0)
                    {
                        a = 0;
                        break;
                    }

                    --part2remain;

                    if (getOneBit())
                        values -= a;
                }

                for (int i = 0; i < 4; ++i)
                {
                    if ((i & 1) == 0)
                    {
                        if (mc == 0)
                        {
                            mc = *map++;
                            cb = *map++;
                            v = granule.pow2gain[((*scf++) + (*pretab++)) << shift];
                        }
                        --mc;
                    }

                    if ((a & (0x8 >> i)))
                    {
                        max = cb;

                        if (part2remain <= 0)
                            break;

                        --part2remain;
                        *xrpnt++ = getOneBit() ? -v : v;
                    }
                    else
                        *xrpnt++ = 0;
                }
            }

            zeromem (xrpnt, (size_t) (&xr[32][0] - xrpnt) * sizeof (float));

            granule.maxBandl = (uint32) (max + 1);
            granule.maxb = (uint32) constants.longLimit[sampleRate][granule.maxBandl];
        }

        while (part2remain > 16)
        {
            getBits (16);
            part2remain -= 16;
        }

        if (part2remain > 0)
            getBits (part2remain);
        else if (part2remain < 0)
            return true;

        return false;
    }

    void layer3Hybrid (float fsIn[32][18], float tsOut[18][32], int ch, const Layer3SideInfo::Info& granule) noexcept
    {
        auto* ts = (float*) tsOut;
        float* rawout1, *rawout2;
        int sb = 0;

        {
            int b = hybridBlockIndex[ch];
            rawout1 = hybridBlock[b][ch];
            b = 1 - b;
            rawout2 = hybridBlock[b][ch];
            hybridBlockIndex[ch] = b;
        }

        if (granule.mixedBlockFlag)
        {
            sb = 2;
            DCT::dct36 (fsIn[0], rawout1, rawout2, constants.win[0], ts);
            DCT::dct36 (fsIn[1], rawout1 + 18, rawout2 + 18, constants.win1[0], ts + 1);
            rawout1 += 36;
            rawout2 += 36;
            ts += 2;
        }

        auto bt = granule.blockType;

        if (bt == 2)
        {
            for (; sb < (int) granule.maxb; sb += 2, ts += 2, rawout1 += 36, rawout2 += 36)
            {
                DCT::dct12 (fsIn[sb], rawout1, rawout2, constants.win[2], ts);
                DCT::dct12 (fsIn[sb + 1], rawout1 + 18, rawout2 + 18, constants.win1[2], ts + 1);
            }
        }
        else
        {
            for (; sb < (int) granule.maxb; sb += 2, ts += 2, rawout1 += 36, rawout2 += 36)
            {
                DCT::dct36 (fsIn[sb], rawout1, rawout2, constants.win[bt], ts);
                DCT::dct36 (fsIn[sb + 1], rawout1 + 18, rawout2 + 18, constants.win1[bt], ts + 1);
            }
        }

        for (; sb < 32; ++sb, ++ts)
        {
            for (int i = 0; i < 18; ++i)
            {
                ts[i * 32] = *rawout1++;
                *rawout2++ = 0;
            }
        }
    }

    void synthesiseStereo (const float* bandPtr0, const float* bandPtr1, float* out0, float* out1, int& samplesDone) noexcept
    {
        auto dummy = samplesDone;
        synthesise (bandPtr0, 0, out0, dummy);
        synthesise (bandPtr1, 1, out1, samplesDone);
    }

    void synthesise (const float* bandPtr, int channel, float* out, int& samplesDone)
    {
        out += samplesDone;
        const int bo = channel == 0 ? ((synthBo - 1) & 15) : synthBo;
        float (*buf)[0x110] = synthBuffers[channel];
        float* b0;
        auto bo1 = bo;

        if (bo & 1)
        {
            b0 = buf[0];
            DCT::dct64 (buf[1] + ((bo + 1) & 15), buf[0] + bo, bandPtr);
        }
        else
        {
            ++bo1;
            b0 = buf[1];
            DCT::dct64 (buf[0] + bo, buf[1] + bo1, bandPtr);
        }

        synthBo = bo;
        const float* window = constants.decodeWin + 16 - bo1;

        for (int j = 16; j != 0; --j, b0 += 16, window += 32)
        {
            auto sum = window[0] * b0[0];  sum -= window[1] * b0[1];
            sum += window[2]  * b0[2];   sum -= window[3]  * b0[3];
            sum += window[4]  * b0[4];   sum -= window[5]  * b0[5];
            sum += window[6]  * b0[6];   sum -= window[7]  * b0[7];
            sum += window[8]  * b0[8];   sum -= window[9]  * b0[9];
            sum += window[10] * b0[10];  sum -= window[11] * b0[11];
            sum += window[12] * b0[12];  sum -= window[13] * b0[13];
            sum += window[14] * b0[14];  sum -= window[15] * b0[15];
            *out++ = sum;
        }

        {
            auto sum = window[0] * b0[0];   sum += window[2] * b0[2];
            sum += window[4]  * b0[4];   sum += window[6]  * b0[6];
            sum += window[8]  * b0[8];   sum += window[10] * b0[10];
            sum += window[12] * b0[12];  sum += window[14] * b0[14];
            *out++ = sum;
            b0 -= 16; window -= 32;
            window += (ptrdiff_t) bo1 << 1;
        }

        for (int j = 15; j != 0; --j, b0 -= 16, window -= 32)
        {
            auto sum = -window[-1] * b0[0];  sum -= window[-2] * b0[1];
            sum -= window[-3]  * b0[2];   sum -= window[-4]  * b0[3];
            sum -= window[-5]  * b0[4];   sum -= window[-6]  * b0[5];
            sum -= window[-7]  * b0[6];   sum -= window[-8]  * b0[7];
            sum -= window[-9]  * b0[8];   sum -= window[-10] * b0[9];
            sum -= window[-11] * b0[10];  sum -= window[-12] * b0[11];
            sum -= window[-13] * b0[12];  sum -= window[-14] * b0[13];
            sum -= window[-15] * b0[14];  sum -= window[0]   * b0[15];
            *out++ = sum;
        }

        samplesDone += 32;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MP3Stream)
};

//==============================================================================
static const char* const mp3FormatName = "MP3 file";

//==============================================================================
class MP3Reader final : public AudioFormatReader
{
public:
    MP3Reader (InputStream* const in)
        : AudioFormatReader (in, mp3FormatName),
          stream (*in), currentPosition (0),
          decodedStart (0), decodedEnd (0)
    {
        skipID3();
        const int64 streamPos = stream.stream.getPosition();

        if (readNextBlock())
        {
            bitsPerSample = 32;
            usesFloatingPointData = true;
            sampleRate = stream.frame.getFrequency();
            numChannels = (unsigned int) stream.frame.numChannels;
            lengthInSamples = findLength (streamPos);
        }
    }

    bool readSamples (int* const* destSamples, int numDestChannels, int startOffsetInDestBuffer,
                      int64 startSampleInFile, int numSamples) override
    {
        if (destSamples == nullptr)
        {
            jassertfalse;
            return false;
        }

        if (currentPosition != startSampleInFile)
        {
            if (! stream.seek ((int) (startSampleInFile / 1152 - 1)))
            {
                currentPosition = -1;
                createEmptyDecodedData();
            }
            else
            {
                decodedStart = decodedEnd = 0;
                const int64 streamPos = stream.currentFrameIndex * 1152;
                int toSkip = (int) (startSampleInFile - streamPos);
                jassert (toSkip >= 0);

                while (toSkip > 0)
                {
                    if (! readNextBlock())
                    {
                        createEmptyDecodedData();
                        break;
                    }

                    const int numReady = decodedEnd - decodedStart;

                    if (numReady > toSkip)
                    {
                        decodedStart += toSkip;
                        break;
                    }

                    toSkip -= numReady;
                }

                currentPosition = startSampleInFile;
            }
        }

        while (numSamples > 0)
        {
            if (decodedEnd <= decodedStart && ! readNextBlock())
            {
                for (int i = numDestChannels; --i >= 0;)
                    if (destSamples[i] != nullptr)
                        zeromem (destSamples[i] + startOffsetInDestBuffer, (size_t) numSamples * sizeof (float));

                return false;
            }

            const int numToCopy = jmin (decodedEnd - decodedStart, numSamples);
            float* const* const dst = reinterpret_cast<float* const*> (destSamples);
            memcpy (dst[0] + startOffsetInDestBuffer, decoded0 + decodedStart, (size_t) numToCopy * sizeof (float));

            if (numDestChannels > 1 && dst[1] != nullptr)
                memcpy (dst[1] + startOffsetInDestBuffer, (numChannels < 2 ? decoded0 : decoded1) + decodedStart, (size_t) numToCopy * sizeof (float));

            startOffsetInDestBuffer += numToCopy;
            decodedStart += numToCopy;
            currentPosition += numToCopy;
            numSamples -= numToCopy;
        }

        return true;
    }

private:
    MP3Stream stream;
    int64 currentPosition;
    enum { decodedDataSize = 1152 };
    float decoded0[decodedDataSize], decoded1[decodedDataSize];
    int decodedStart, decodedEnd;

    void createEmptyDecodedData() noexcept
    {
        zeromem (decoded0, sizeof (decoded0));
        zeromem (decoded1, sizeof (decoded1));
        decodedStart = 0;
        decodedEnd = decodedDataSize;
    }

    bool readNextBlock()
    {
        for (int attempts = 10; --attempts >= 0;)
        {
            int samplesDone = 0;
            const int result = stream.decodeNextBlock (decoded0, decoded1, samplesDone);

            if (result > 0 && stream.stream.isExhausted())
            {
                createEmptyDecodedData();
                return true;
            }

            if (result <= 0)
            {
                decodedStart = 0;
                decodedEnd = samplesDone;
                return result == 0;
            }
        }

        return false;
    }

    void skipID3()
    {
        const int64 originalPosition = stream.stream.getPosition();
        const uint32 firstWord = (uint32) stream.stream.readInt();

        if ((firstWord & 0xffffff) == 0x334449)
        {
            uint8 buffer[6];

            if (stream.stream.read (buffer, 6) == 6
                 && buffer[0] != 0xff
                 && ((buffer[2] | buffer[3] | buffer[4] | buffer[5]) & 0x80) == 0)
            {
                const uint32 length = (((uint32) buffer[2]) << 21)
                                    | (((uint32) buffer[3]) << 14)
                                    | (((uint32) buffer[4]) << 7)
                                    |  ((uint32) buffer[5]);

                stream.stream.skipNextBytes (length);
                return;
            }
        }

        stream.stream.setPosition (originalPosition);
    }

    int64 findLength (int64 streamStartPos)
    {
        int64 numFrames = stream.numFrames;

        if (numFrames <= 0)
        {
            const int64 streamSize = stream.stream.getTotalLength();

            if (streamSize > 0)
            {
                const int bytesPerFrame = stream.frame.frameSize + 4;

                if (bytesPerFrame == 417 || bytesPerFrame == 418)
                    numFrames = roundToInt ((double) (streamSize - streamStartPos) / 417.95918); // more accurate for 128k
                else
                    numFrames = (streamSize - streamStartPos) / bytesPerFrame;
            }
        }

        return numFrames * 1152;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (MP3Reader)
};

}

//==============================================================================
MP3AudioFormat::MP3AudioFormat()  : AudioFormat (MP3Decoder::mp3FormatName, ".mp3") {}
MP3AudioFormat::~MP3AudioFormat() {}

Array<int> MP3AudioFormat::getPossibleSampleRates() { return {}; }
Array<int> MP3AudioFormat::getPossibleBitDepths()   { return {}; }
bool MP3AudioFormat::canDoStereo()                  { return true; }
bool MP3AudioFormat::canDoMono()                    { return true; }
bool MP3AudioFormat::isCompressed()                 { return true; }
StringArray MP3AudioFormat::getQualityOptions()     { return {}; }

AudioFormatReader* MP3AudioFormat::createReaderFor (InputStream* sourceStream, const bool deleteStreamIfOpeningFails)
{
    std::unique_ptr<MP3Decoder::MP3Reader> r (new MP3Decoder::MP3Reader (sourceStream));

    if (r->lengthInSamples > 0)
        return r.release();

    if (! deleteStreamIfOpeningFails)
        r->input = nullptr;

    return nullptr;
}

AudioFormatWriter* MP3AudioFormat::createWriterFor (OutputStream*, double /*sampleRateToUse*/,
                                                    unsigned int /*numberOfChannels*/, int /*bitsPerSample*/,
                                                    const StringPairArray& /*metadataValues*/, int /*qualityOptionIndex*/)
{
    jassertfalse; // not yet implemented!
    return nullptr;
}

#endif

} // namespace juce